knurzel:~# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 mail.meinvps.de ESMTP Postfix (Debian/GNU)
ehlo localhost
250-mail.meinvps.de
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250 8BITMIME
quit
221 Bye
Connection closed by foreign host.