send mail without smtp server

# Python core programming network protocol programming Email Email system components:MTA message transmission proxy, responsible for mail routing, queue and sending SMTP Simple Mail Transfer Protocol1. Connect to the server2 Login3. Send a service request4. Exit POP: Post Office ProtocolRFC918 "Post Office Protocol aim

cheat and lie, but generally the server can detect it.The address specified in the mail from command is the sender address.Rcpt to identifies a single email recipient; multiple rcpt to can be used; it is often behind the MAIL command.After one or more RCPT commands, data indicates that all Email recipients have been identified, and data transmission is initializ

settings: Receiving mail (POP3) server-requires SSL: pop.gmail.com Use SSL: Yes Port 995 Send mail (SMTP) server-TLS or SSL: smtp.gmail.com (use authentication) Use authentication: Yes TLS/STARTTLS Port: 587 SSL port 465 Account

, program B can also change from receiving SMTP to sending SMTP. If you want to refuse to change the role, the recipient can send a 502 message as a response. Note: this command is optional. This command is generally not used when a TCP transmission channel is used. However, this command is useful when the cost of establishing a transmission channel is relatively

The following is a PHP example program that I found directly using SMTP to send mail (adapted), but the server always prompts: the system busy! And the message could not be sent. Who knows how to handle it? Another: How do you handle validation when the SMTP

From: author :( 2001-11-2309: 08: 00) Step 2: forward the host to the target host R: 220BBN-VAX.ARPASimpleMailTransferServiceReadyS: HELOUSC-ISIE.ARPAR: 250BBN-VAX.ARPAS: MAILFROM: @ USC-ISIE.ARPA: JQP @ MIT-AI label: SMTP from: Author: (09:08:00) Step 2: forward the host to the target host R: 220 BBN-VAX.ARPA Simple Mail Transfer Service Ready S: HELO USC-ISIE.ARPA R: 250 BBN-VAX.ARPA 　 S:

Handlesendemail.aspx logicprotected void Page_Load (Object Sender,eventargs e){foreach (var item in Request.Form.Keys){if (item. ToString (). Startswidth ("Txtmail")){String Mail=request.form[item. ToString ()];Setting up SMTP servers and portsSmtpClient smtpclient=new smtpclient ("[Email protected]", 25);Set the user name and password to log on to the SMTP servi

to the receiving end path. The Mail Exchange server of the Domain Name Service system (DNS) can be used to identify the next hop IP address that transmits messages. Protocol structure The SMTP command is the ASCII information sent between the SMTP hosts, which may be as follows: 　　 Command Describe

ways to send mail using external mailboxes Bin/mail will use the local sendmail to send mail by default, which requires local machines to install and start the SendMail service, is cumbersome to configure, and can cause unnecessaryResource occupancy. By modifyin

failed # login failure due to direct user name and passwordAUTH LOGIN334 dxnlcm5hbwu6Y3jhenl3awxs334 ugfzc3dvcmq6Bxlwyxnzd29yza =235 authentication successful # log on successfully using base64 encodingMail from: 553 you are not authorized to send mail, authentication is required # mail cannot be forgedMail from: 250 mail