~$ telnet localhost 25

Trying 127.0.0.1…

Connected to localhost.localdomain.

Escape character is ‚^]‘.

220 server.localhost ESMTP Postfix (Debian/GNU)

mail

501 5.5.4 Syntax: MAIL FROM:

ehlo x

250-server.localhost

250-PIPELINING

250-SIZE 10240000

250-VRFY

250-ETRN

…… usw.

mail from:<name>

250 2.1.0 Ok

rcpt to:<fritz@muster.com>

250 2.1.5 Ok

data

354 End data with <CR><LF>.<CR><LF>

Testmail

.

250 2.0.0 Ok: queued as BD9431FBD214

quit

221 2.0.0 Bye

Connection closed by foreign host.