Simple ASP. NET mail sending program (1)

Today I learned to write a simple email.ProgramIs sent using the SMTP server of IIS (the jmail component is used for the next step). After testing, an email is successfully sent to your mailbox. I feel very interesting. I hope I can write software similar to Foxmail in the future. Well, come on ~~~

1. Install the SMTP service

Install this component: 'Control panel '-> 'add or delete project'-> 'add or delete windows components'-> 'application Server'-> 'Internet Information Service (IIS)'->SMTP Service

2. Configure the SMTP Virtual Machine

On the 'Control panel '-> 'administrative tools'-> 'iis manager'-> 'default SMTP vserver'-> 'properties', enter the local IP address, select other items as needed.

3. Design the email sending Interface

Recipient: tbreceiver

Sender: tbsender

Sender email Username: tbsenderusername

Sender's email password: tbsenderpsw

Topic: tbsubject

Content: tbcontent

Attachment: fuattachment// Fileupload Control

Send: btnsend

4. Main ApplicationSystem. net. MailClass to write the mail sending program

MainCodeAs follows:

// Introduce three namespaces

Using system. IO;
Using system. net. mail;
Using system. net. Mime;

Protected void btnsend_click (Object sender, eventargs E)
{
Try
{
If (this. tbreceiver. Text! = String. Empty & this. tbsender. Text! = String. Empty)
{
// Create an email
Mailmessage mymail = new mailmessage (this. tbsender. text. trim (), this. tbreceiver. text. trim (), this. tbsubject. text. trim (), this. tbcontent. text. trim ());
Mymail. Priority = mailpriority. High;
// Create an attachment
If (this. fuattach. filename! = NULL)
{
String filepath = This. fuattachment. postedfile. filename;
Fileinfo Fi = new fileinfo (filepath );
If (Fi. exists)
{
Attachment myattachment = new attachment (filepath, mediatypenames. application. octet );
Contentdisposition disposition = myattachment. contentdisposition;
Disposition. creationdate = file. getcreationtime (filepath );
Disposition. modificationdate = file. getlastwritetime (filepath );
Disposition. readdate = file. getlastaccesstime (filepath );
Mymail. attachments. Add (myattachment );
}
}
// Send the attachment
Smtpclient client = new smtpclient ("smtp.163.com", 25 );
Client. Credentials = new system. net. networkcredential (this. tbuser. Text. Trim (), this. tbpsw. Text. Trim ());
Client. Send (mymail );

Response. Redirect ("mailinfo. aspx ");// Sending success prompt page
}
}
Catch
{
Response. Write ("<font color = Red> email sending failed! Possible cause: 1) Recipient address does not exist 2) sender address does not exist 3) User Name or Password error </font> ");// Error message prompt
}
Finally
{}
}