~$ telnet localhost 25
Trying 127.0.0.1…
Connected to localhost.localdomain.
Escape character is ‚^]‘.
220 server.localhost ESMTP Postfix (Debian/GNU)
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.