1:  > 220 mail.example.com SMTP Foo Mailserver
 2:  < HELO mail.example.org
 3:  > 250 Ok
 4:  < MAIL FROM: hans.muster@example.org
 5:  > 250 Ok
 6:  < RCPT TO: foo@example.com
 7:  > 250 Ok
 8:  < DATA
 9:  > 354 End data with .
10: < From: hans.muster@example.org
11: < To: foo@example.com
12: < Subject: Testmail
13: <
14: < Testmail
15: < .
16: > 250 Ok
17: < QUIT
18: > 221 Bye