. Net

There are three main classes:

1. smtpmail

Smtpmail. Send (mailmessage );

2. mailmessage

Attribute: From to subject priority (priority high, low, normal) attachments bcc (dark sending Address) CC (CC address) Body (Mail content) bodyformat (Mail format) bodyencoding (base64, uuencode)

3. mailattachment

Set SMTP server in IIS

Use SOCKET to implement the email system

POP3. 110

SMTP 25

Common commands:

Send: mailfrom rcpto data

Receive mail: Stat (query new mail) Return (View content) Delete

When I was interviewed, I was asked a question about the mass mailing. At every night, the mass mailing was realized.

TCP communication:

System. net. Socket

Tcpclient (client class, which communicates with the service through the TCP protocol and obtains information, and encapsulates the socket class internally) tcplistener (server class, which listens to requests sent from the client)