How to Use winmail to set up a virus-free email system

I. Preface
Ii. Basic Knowledge
1. What is an IP address?
2. What is a fixed IP address?
3. What is a dynamic IP address?
4. What is a domain name? What makes a domain name?
5. What are subdomain names and second-level domain names?
6. What is DNS?
7. What is a record?
8. What is an alias record (cname )?
9. What is an MX record?
10. What is a dynamic domain name?
3. Dynamic Domain Name application and settings
1. Dynamic domain name resolution process
2. Dynamic Domain Name application and settings
Iv. Domain Name application and settings
1. Domain Name application
2. Domain Name settings
A. Domain Name and fixed IP Address Settings
B. Cooperation between domain names and dynamic domain names
5. Install the winmail System
1. Preparations
2. System Installation
Vi. settings of winmail Mail System
1. Quick wizard settings
2. service status check
3. SMTP parameter settings
VII. Mail sending and receiving Test
1. Use webmail to send and receive emails
2. Setting and sending and receiving emails in Outlook Express
8. Install and set anti-virus software
1. Anti-Virus Software settings
2. Email system settings
3. send and receive Test
IX. FAQs

I. Preface

With the rapid development of network technology, the E-mail system has become an essential part of the daily operation of enterprises. According to a survey by an authoritative international research institute, e-mail is the most basic and most frequently used Internet service. It is convenient and convenient to communicate via e-mail. It can be said that almost no Internet user does not send or receive e-mails, or even some users access the internet simply to send and receive e-mails.

However, email is like a double-edged sword. On the one hand, e-mail has greatly promoted the informatization construction, production efficiency and service quality of enterprises. Personal users can use e-mail conveniently, quickly, efficiently, and economically. On the other hand, due to the openness of the network and the ease of computer information diffusion, it has a serious vulnerability in processing, storage, transmission and use, that is, it is easily disturbed and abused, A large number of spam, e-bombs, and email viruses have greatly plagued users. With the expansion of enterprise business, the number of emails being sent and received gradually increases, and the possibility of being attacked by mail viruses and spam is also increasing. This protects the email system against viruses, anti-spam poses new requirements.

The winmail server can be integrated with anti-virus software installed on your operating system (supporting almost all anti-virus engines) to scan incoming and outgoing emails. It is inspected by the Anti-Virus engine before the email arrives at the user mailbox, effectively isolate and clear infected emails. It also provides the IP address and domain name, mail source, mail header and body, and mail host reverse lookup to identify fake mail headers and two-way account monitoring functions, effectively prevents the intrusion of junk emails and illegal information. For more information, see www.magicwinmail.com.

Ii. Basic Knowledge

1. What is an IP address?
An IP address is a 32-bit digital identifier assigned to each computer or network device on the network. On the Internet, the IP address of each computer or network device is the only one in the world. The IP address format is XXX. XXX, where XXX is an integer between 0 and 255. For example, the IP address of the Sina website host is 61.172.201.htm.

2. What is a fixed IP address?
A fixed IP address is an IP address that is assigned to a computer or network device for a long time. Generally, computers that use leased lines have a fixed Internet IP address.

3. What is a dynamic IP address?
For computers that use modem, ISDN, ADSL, wired broadband, residential broadband, and other methods to access the Internet, the IP addresses allocated for each access vary. This is a dynamic IP address. Because IP Address resources are precious, most users access the Internet through dynamic IP addresses.

4. What is a domain name? What makes a domain name?
A domain name is the name used to search for a website on the Internet. It is an important identifier on the Internet and is equivalent to a host's house number. Each host corresponds to an IP address. Each IP address consists of a series of numbers, such as 101.25.11.34. In order to facilitate memory, people use domain names instead of these numbers to search for hosts, such as mydomain.com. Each domain name corresponds to an IP address. People enter a domain name and then resolve the Domain Name Server (DNS) to an IP address to find the corresponding website. Domain names are required for each website or email. An English international domain name can contain up to 67 characters (including suffixes) and can contain English letters, Arabic numerals, and hyphens, each level can contain up to 22 letters. The length of a third-level domain name in China cannot exceed 20 characters.

5. What are subdomain names and second-level domain names?
A subdomain name is a relative concept and relative to a parent domain name. Domain names have many levels, separated by vertices. For example, if a company's top-level domain name ends with COM, all domain names ending with COM are its subdomains. For example, www.amaxit.net is the subdomain of amaxit.net, while amaxit.net is the subdomain of net.

6. What is DNS?
Domain Name System (DNS) refers to the domain name resolution server. Its role on the Internet is to convert a domain name into an IP address that can be recognized by the network. For example, the input www.163.com will be automatically converted to 202.108.42.72

7. What is a record?
The A (Address) record is used to specify the IP address record corresponding to the Host Name (or domain name. You can direct the Host Name (second-level domain name) under this domain name to your server.

8. What is an alias record (cname )?
It is also called a canonical name. This record allows you to map multiple names to the same computer. It is usually used on computers that provide both WWW and mail services. For example, there is a computer named "host.mydomain.com" (a record ). It provides WWW and mail services at the same time, in order to facilitate user access to the service. You can set two aliases (cname) for the computer: WWW and mail. The full names of these two aliases are www.mydomain.com and mail.mydomain.com ". In fact, they all point to "host.mydomain.com ".

9. What is an MX record?
The MX (Mail exchanger) record is a mail exchange Record pointing to an email server. It is used to locate the email server based on the recipient's address suffix when the email system sends an email. For example, when a user on the Internet wants to send a letter to a user@mydomain.com, the user's email system looks for the MX record for the domain name mydomain.com through DNS, if the MX record exists, the user's computer sends the email to the email server specified by the MX record.

10. What is a dynamic domain name?
Domain name resolution on the internet is generally static, that is, the IP address of a domain name is static and remains unchanged for a long time. That is to say, if you want to provide services on the Internet, such as building a website and setting up an email system, you usually need a fixed IP address.
The dynamic domain name function is to resolve a fixed domain name to a dynamic IP address. Every time a user connects to the Internet, a new IP address is automatically obtained. The dynamic domain name software installed on the user's computer sends the IP address to the dynamic domain name resolution server to update the domain name resolution database. When other people on the internet want to access this domain name, the dynamic domain name resolution server will return the correct IP address to him.
Because most Internet users are allocated Dynamic IP addresses when accessing the Internet. Using the traditional static domain name resolution method, it is unrealistic for a user to interpret the domain name to a computer on which he or she is surfing the Internet. With dynamic domain names, this dream can come true. You can apply for a domain name and use the dynamic domain name resolution service to bind the domain name to your computer, which allows Internet users to access your computer conveniently.

3. Dynamic Domain Name application and settings

If you already have a fixed IP address, skip this step and read "Domain Name application and settings"

1. Dynamic domain name resolution process

The dynamic domain name resolution system maps users' Dynamic IP addresses to a fixed domain name resolution service (ddns ). The dynamic domain name resolution system consists of two parts: the first part is the server end.ProgramIs located on the host of the service provider; the other is the client program, which runs on the host of the majority of users. Each time you connect to the network, the client program transmits the dynamic IP address of the client host to the server program on the server provider's host, the server program is responsible for providing DNS services and implementing dynamic domain name resolution services. After receiving a notification from the client, the server program immediately updates data and binds the new IP address to the original fixed domain name, this completes the dynamic domain name resolution service. Other people can access your server through the domain name.

2. Dynamic Domain Name application and settings

Below we take the peanut shell (http://www.oray.net/) as an example to describe the dynamic domain name application and set the whole process, other service providers of dynamic domain name settings are similar to this, users can learn about the dynamic Domain Name Service Providers in http://www.magicwinmail.com/technic_dnip.htm.

1) After logging in to the user, click "Domain Name Service Center"

500) {This. resized = true; this. style. width = 500;} "border = 1>

2) Click "register domain name record" to apply for a free Domain Name winmailtest.vicp.net

Description: Winmailtest.vicp.net is used as an example in the configuration process. You can set the domain name to be applied according to your actual situation, set up the email system with the newly applied domain name.

500) {This. resized = true; this. style. width = 500;} "border = 1>

3) activate the peanut shell Service

500) {This. resized = true; this. style. width = 500;} "border = 1 resized =" true ">

4) read the User Agreement, agree, and click "Next"

5) Fill in Domain Name Information Based on your actual situation

500) {This. resized = true; this. style. width = 500;} "border = 1 resized =" true ">

6) after completion, you can see in "manage peanut shell service" that the status has changed to activated.

500) {This. resized = true; this. style. width = 500;} "border = 1 resized =" true ">

7) install the peanut shell client program
Download the peanut shell client program on your email server and install it. After the installation is successful, enter the login user name and password.

500) {This. resized = true; this. style. width = 500;} "resized =" true ">

Then, set the dynamic domain name winmailtest.vicp.net that has been injected in the peanut shell client program.

500) {This. resized = true; this. style. width = 500;} "resized =" true ">

After setting, the client program of the peanut shell updates the changed IP address and dynamic domain name winmailtest.vicp.net at a specified time.

500) {This. resized = true; this. style. width = 500;} ">

Iv. Domain Name application and settings

1. Domain Name application

At present, there are many service providers that provide domain name applications in China. The following lists common service providers for examination.
Hichina http://www.net.cn
Xinnet http://www.xinnet.com
Business http://www.bizcn.com China

For domain name applications, please refer to the relevant instructions on various websites. Domain names generally pay a certain service fee every year.

2. Domain Name settings

Next we take hichina (http://www.net.cn/) as an example to describe the whole process of settings, other Domain Name Service providers provide domain name settings similar to this, users can also learn here in http://www.magicwinmail.com/technic_dns.htmDomain Name and DNS knowledge.

If you have a fixed IP address, see "A. Domain Name and fixed IP Address Settings" below ";
If you have applied for a dynamic domain name without a fixed IP address, see "B. Domain Name and dynamic domain name cooperation ". If you have not applied for a dynamic domain name, see "2. Dynamic Domain Name application and settings" above"

A. Domain Name and fixed IP Address Settings

1) After logging on to the user, click "Domain Name management"

500) {This. resized = true; this. style. width = 500;} "border = 1>

2) Select the domain name you want to set, for example, set the domain name magicwinmail.com

500) {This. resized = true; this. style. width = 500;} "border = 1>

3) add MX record under add new record, type select MX--MX record, value can fill in host name, also can fill in your fixed IP address. Enter the host name mail.magicwinmail.com and set the priority to 10.

Description: The last vertex of the value indicates that the host name ends. When some Domain Name Service Provider website settings are not automatically added for you, if it is missing, the DNS server will automatically add your domain name during resolution, which will cause resolution errors.

500) {This. resized = true; this. style. width = 500;} "border = 1>

4) if the MX record is set to the host name or domain name, you need to add the corresponding a record. For example, if the MX record value is set to mail.magicwimail.com., you need to add a corresponding a record.

500) {This. resized = true; this. style. width = 500;} "border = 1>

5) after adding the record, you can view the MX record and a record you set in the record list.

500) {This. resized = true; this. style. width = 500;} "border = 1>

B. Cooperation between domain names and dynamic domain names

1) After logging in, click "Domain Name management"

500) {This. resized = true; this. style. width = 500;} "border = 1>

2) Select the domain name you want to set, for example, set the domain name magicwinmail.com

500) {This. resized = true; this. style. width = 500;} "border = 1>

3) add MX record under "Add new record", type select MX--MX record, value can fill in dynamic domain name winmailtest.vicp.net, priority is generally set to 10.

note : The last vertex of the value, indicating that the host name ends. When some Domain Name Service Provider website settings are not automatically added for you, if it is missing, the DNS server will automatically add your domain name during resolution, which will cause resolution errors.

500) {This. resized = true; this. style. width = 500;} "border = 1>

4) hichina also provides a host name that can point to an alias (cname record). In this case, we can set a host name mail.magicwimail.com to point to the dynamic domain name winmailtest.vicp.net.

500) {This. resized = true; this. style. width = 500;} "border = 1>

5) after adding the cname record, you can view the MX record and cname record you set in the record list.

500) {This. resized = true; this. style. width = 500;} "border = 1>

Note::
1. It generally takes 12-24 hours for the MX or a record of the domain name to take effect. The update time of each domain name service provider is not the same, so the effective time is different.
In the following installation and setting process, we assume that the domain name setting has taken effect. Before the domain name settings take effect, you can use your IP address or dynamic domain name address to replace the host name.
2.In the configuration process, we use winmailtest.vicp.netAnd winmail.comAs an example, you can set the domain name to be applied for based on your actual situation, and set the mail system with the newly applied domain name.
5. Install the winmail System

1. Preparations

If you do not have the winmail Server installation package, you can go to the http://www.magicwinmail.com/to download the latest Installer

Before installing the system, you must select an operating system platform. The winmail server can be installed on Windows 98/Me, Windows NT4, Windows 2000, Windows XP, Windows 2003, and other Win32 operating systems.

2. System Installation

The installation process is similar to the general software. The following describes only the steps that need attention, such as installing components, installing directories, running methods, and setting the administrator login password.

1) Start Installation
Double-click the winmail Server Installation Package and select "yes" to continue installation

500) {This. resized = true; this. style. width = 500;} ">

2) Select the installation language.

500) {This. resized = true; this. style. width = 500;} ">

3) Click "Next" to continue the installation.

500) {This. resized = true; this. style. width = 500;} ">

4) read the winmail server license, agree, select "I accept this agreement", and click "Next" to continue the installation

500) {This. resized = true; this. style. width = 500;} ">

5) Select the installation directory

500) {This. resized = true; this. style. width = 500;} ">

Note: It is recommended that you do not use a Chinese directory because the correct path cannot be found during control registration, and the system may not run properly.

6) select to install the component
The main components of winmail server include the server core and management tools.
The core of the server is to complete services such as SMTP, POP3, admin, and HTTP.
Management tools are mainly used to set the mail system, such as system parameters, user management, and domain management.

500) {This. resized = true; this. style. width = 500;} ">

7) Select an additional task
There are two core server running methods: running as a system service and running a program separately.
Running as a system service is only valid when your operating system platform is Windows NT4, Windows 2000, Windows XP, and Windows 2003;
It is applicable to all Win32 operating systems.
During the installation process, if the configuration file already exists, the installer will allow you to choose whether to overwrite the existing configuration file. Note that you must select "retain original settings" during the upgrade ".

500) {This. resized = true; this. style. width = 500;} ">

8) set the password.
In the previous step, if you choose to overwrite the existing configuration file or install it for the first time, the installer will also allow you to enter the system administrator password and System Administrator email password, set a secure password for security, which can be modified later.

500) {This. resized = true; this. style. width = 500;} ">

10) Click "Install" to start installing the program to your computer.

500) {This. resized = true; this. style. width = 500;} ">

11) Click "OK" to complete the installation.

500) {This. resized = true; this. style. width = 500;} ">

12) Installation successful

500) {This. resized = true; this. style. width = 500;} ">

After the system is successfully installed, the installer allows you to choose whether to run the winmail server program immediately.

If the program runs successfully, the system tray area will display the icon 500) {This. resized = true; this. style. width = 500;} ">;
If the program fails to be started, the user will see the icon 500 in the system tray area) {This. resized = true; this. style. width = 500;} ">.

In this case, you can go to "Administrative Tools"/"Event Viewer" in Windows to view the system "application logs" and learn the cause of winmail server program startup failure.
Note:: If you are prompted to restart the system, be sure to restart
 

Vi. settings of winmail Mail System

1. Quick wizard settings

After the installation is complete, the Administrator must perform initialization settings for the system to run properly. When the server is started, if it finds that no domain name has been set, the quick setting wizard is automatically run. You can use it to set up the mail server easily and quickly.

500) {This. resized = true; this. style. width = 500;} ">

Enter a new email address and password, and click "set". The setting wizard automatically finds whether the database has the email address and domain name to be created, if no new domain name or mailbox is found, the wizard adds a new domain name or mailbox to the database, and tests whether the SMTP, POP3, admin, and HTTP servers are successfully started. After the setting is complete, the setting information and server test information are reported in the "setting result" column. The setting result displays the setting information about the mail client software at the bottom.

2. service status check

After logging on to the management tool, use "system settings"/"system services" to check whether SMTP, POP3, admin, HTTP, IMAP, LDAP, and other services are running properly. The green icon indicates that the service is successfully running, and the red icon indicates that the service is stopped.

500) {This. resized = true; this. style. width = 500;} ">

If you find that services such as SMTP, POP3, admin, HTTP, IMAP, or LDAP have not been started successfully, use "system log"/"system" to view the system startup information.

500) {This. resized = true; this. style. width = 500;} ">

If the startup fails, it is generally because the port is occupied and cannot be started. Close the occupied program or change the port and restart the related services. For example, when Windows 2000 is installed by default, the SMTP service of IIS will be installed, resulting in the failure of the SMTP service in the mail system. If you cannot find the occupied program, you can use a tool named active ports software to view that program occupies the port, you can download to the http://www.magicwinmail.com/download_other.htm#viewport.

3. SMTP basic parameter settings

Open the winmail management tool and set relevant parameters under "system settings"> "SMTP Settings"> "Basic Parameters". These parameters are related to the normal sending and receiving of emails, therefore, set the parameters reasonably and in a standardized manner based on the actual situation.

500) {This. resized = true; this. style. width = 500;} "originwidth =" 674 "originheight =" 456 ">

(1) Recycling mailbox of the error mail: the default is postmaster@yourdomain.com, when the system has an error message does not know to deliver there, it will be delivered to the mailbox. Therefore, you must set a valid email address.
2) HELO/EHLO host name: the HELO/EHLO host name must be set properly. Otherwise, some email service providers refuse to accept your emails, such as Sina.com and 163.com.
3) Maximum number of recipients for each mail: Maximum number of recipients allowed for each mail.
4) Maximum number of bytes per mail: Maximum number of bytes per mail. Indicates the header (sender, recipient, subject, sending time, etc.), encoded email content, and the total bytes of all attachments After encoding.
5) Maximum number of incoming mail hops: the maximum number of SMTP servers allowed by the SMTP service.
6) Retry Interval of failed Emails: the time after which a failed email can be resold. This time cannot be set too short. We recommend that you set it to 30 minutes. 7) maximum time for an email to stay in the queue: the maximum time for each email to be retained in the queue. emails beyond this time will not be sent. This time cannot be too short. We recommend that you set it to 3-5 hours.
8) Enable mail authentication: Only authenticated users can use the SMTP service to forward emails. It can effectively prevent untrusted hosts from sending spam by borrowing servers. We strongly recommend that you enable mail authentication.
9) The sender and authenticated user must be the same: the sender and authenticated user must be the same email account. This effectively prevents users who do not have the permission to send emails from using an account with the permission to send emails.
10) The sender and authenticated user must be the same: the sender and authenticated user must be the same email account. This effectively prevents users who do not have the permission to send emails from using an account with the permission to send emails.
11) authentication is required when sending emails from the domain name in the system: authentication is required when sending emails from the email address containing the domain name in the system. This prevents spammers from sending spams by forging the sender.
12) convert MS-TNEF mail to MIME format mail: MS-TNEF is a special format mail for Microsoft Outlook (only one is named winmail. dat attachments). Most non-Outlook mail client software cannot parse normally. When this feature is enabled, messages for the MS-TNEF can be automatically converted to messages in generic MIME format.
13) Allow SSL/TLS communication: secure connections (SSL/TLS) are supported when receiving external messages ). Generally, the remote server selects the connection mode.
14) Enable the VRFY/expn command: to prevent spammers from obtaining the user list through the VRFY/EXPN Command, these two commands are usually disabled. However, a few external domains (such as verizon.net) require the command for verification. You can set it according to your actual needs.

VII. Sending and receiving emails

1. Use webmail for sending and receiving

1) log on to Webmail

Correct installation. After setting the winmail system, you can use webmail that comes with winmail server to send and receive mails. The default port is 6080, And the login address is http: // yourserverip: 6080, here the login address is http://mail.magicwinmail.com: 6080/

500) {This. resized = true; this. style. width = 500;} ">

2) Click "Write email" to write and send an email.

500) {This. resized = true; this. style. width = 500;} ">

3) Click "inbox" to view received emails

500) {This. resized = true; this. style. width = 500;} ">

2. Setting and sending and receiving Outlook Express

1) Add an email account

Click "Account" in the "Tools" menu, as shown in. In the pop-up "Internet account" dialog box, click "add" and select "email"

500) {This. resized = true; this. style. width = 500;} ">

2) set the sender name

Enter the "Internet Connection Wizard", enter the user's name, and click "Next.

500) {This. resized = true; this. style. width = 500;} ">

3) Fill in the email address

Enter the email address of the added user in the email system to "email address.

500) {This. resized = true; this. style. width = 500;} ">

4) Fill in the email server

Select "POP3" as the receiving email server, and enter the host name or IP address of your email server in the POP3 address of the receiving mail server, fill in the host name or IP address of your email server in SMTP on the sending mail server.

500) {This. resized = true; this. style. width = 500;} ">

5) enter the account name and password

Enter the account name and password of the user in your email system and click Next.

500) {This. resized = true; this. style. width = 500;} ">

6) Account Added

500) {This. resized = true; this. style. width = 500;} ">

7) Modify account attributes

To modify user settings, click "Tools"> "Account" in the menu, select the account you want to set, and press "properties ".

500) {This. resized = true; this. style. width = 500;} ">

500) {This. resized = true; this. style. width = 500;} ">

8) User information can be modified in user information

500) {This. resized = true; this. style. width = 500;} ">

9) Modify account information

If the SMTP service of the mail system activates the "send authentication" function, You must select the "my server requires authentication" option under "external mail server.

500) {This. resized = true; this. style. width = 500;} ">

10) send and receive the test email to the local and external users, and then receive the test email.

8. Install and set anti-virus software

Winmail server supports almost all anti-virus engines, and supports three modes: virus firewall, embedded API, and command line program. It can scan incoming and outgoing emails to effectively clear virus emails.
For the integration steps of winmail server and common anti-virus software, see http://www.magicwinmail.com/antiviruslist.htm. in this case, we choose to use the Norton Firewall (Symantec Antivirus Enterprise Edition 8.0) with winmail server to scan and kill virus emails.

1. Anti-Virus Software settings

1) enable the Norton Antivirus Software
Choose "configuration"> "Automatic File System Protection"> "exclude files and folders"

500) {This. resized = true; this. style. width = 500;} ">

2) Select "file/folder" to exclude

500) {This. resized = true; this. style. width = 500;} ">

3) Select the five directories to exclude scan directories. Take the default installation directory of winmail server as an example. The six directories are

% \ Server \ queue \ bounce
% \ Server \ queue \ Header
% \ Server \ queue \ msg
% \ Server \ queue \ status
% \ Server \ queue \ todo
% \ Server \ store

% Indicates the directory where the email system is installed. We are installing it in c: \ programe files \ magic winmail

500) {This. resized = true; this. style. width = 500;} ">

4) Set "delete infected files" for virus detection. If the operation fails, select "do not operate (only record)" or "clear viruses in files"
At the same time, in order to save system resources and avoid prompting for confirmation every time a virus is detected, we should disable the Norton warning prompt.

500) {This. resized = true; this. style. width = 500;} ">

2. Email system settings

1) winmail server anti-virus settings: "enable scan for virus mail", select "Use File Real-time protection or virus firewall"

500) {This. resized = true; this. style. width = 500;} ">

2) Send a test letter to view the feedback

500) {This. resized = true; this. style. width = 500;} ">

The test is successful. Integration is complete!

3. send and receive mail Test

According to the above settings, we also use Outlook Express and Webmail to send and receive emails for another test. It mainly tests whether there are no attachments, virus attachments, and virus attachments, and whether the sending and receiving emails are normal and whether virus emails can be correctly reported.

Note: When testing a virus email, you can download the harmless standard virus sample eicar for testing at www.eicar.org.

IX. FAQs

1. Why does the email system fail to be started after installation?
2. Why cannot the SMTP service be started successfully?
3. when sending emails to other domains using Outlook and Outlook Express, the message '2017 sorry, your don't authenticate or the domain isn' t in my list of allowed rcpthosts (#5.7.1) is always prompted. How can this problem be solved?
4. in Outlook Express, "my server needs to be verified" has been set, but 550 5.7.1 unable to relay

1. Why does the email system fail to be started after installation?
This may occur in the following situations:
1. the admin service port (Port 6000) is occupied. Download the active ports software to check whether the admin service port is occupied.
2. The registration code is invalid. The trial has expired or the machine time is incorrect.
3. database or system configuration file error.

2. Why cannot the SMTP service be started successfully?
This may occur because the SMTP service in IIS on your machine has not been stopped. Open the management tool of the operating system, find "Simple Mail Transport Protocol (SMTP)" to stop the service, and change the start method to "Manual" or "disabled ".

3. when sending emails to other domains using Outlook and Outlook Express, the message '2017 sorry, your don't authenticate or the domain isn' t in my list of allowed rcpthosts (#5.7.1) is always prompted. How can this problem be solved?
The setting of your SMTP server requires sending authentication, but the client sending tool does not set sending authentication. Please set it.

4. in Outlook Express, "my server needs to be verified" has been set, but 550 5.7.1 unable to relay
1) Telnet yourserverip 25, 220 ************************************** ****
2) enter the EHLO command, and the 502 unimplemented (#5.5.1) is displayed)
3) the front end uses the Cisco PIX Firewall

The mailguard or mailhost created in the Cisco PIX blocks ESMTP commands (such as EHLO)
Disable the mail guard function or contact the firewall supplier.