SMTP

S: 220 smtp.example.com ESMTP Postfix
C: HELO relay.example.org
S: 250 Hello relay.example.org, I am glad to meet you
C: MAIL FROM:＜[email protected]＞
S: 250 Ok
C: RCPT TO:＜[email protected]＞
S: 250 Ok
C: RCPT TO:＜[email protected]＞
S: 250 Ok
C: DATA
S: 354 End data with ＜CR＞＜LF＞.＜CR＞＜LF＞
C: From: "Bob Example" ＜[email protected]＞
C: To: "Alice Example" ＜[email protected]＞
C: Cc: [email protected]
C: Date: Tue, 15 January 2008 16:02:43 -0500
C: Subject: Test message
C:
C: Hello Alice.
C: This is a test message with 5 header fields and 4 lines in the message body.
C: Your friend,
C: Bob
C: .
S: 250 Ok: queued as 12345
C: QUIT
S: 221 Bye
{The server closes the connection}