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telnet mail.example.com 25
Trying 192.0.2.10...
Connected to mail.example.com.
Escape character is '^]'.
220 mail.example.com ESMTP Postfix (Debian/GNU)
EHLO test.example.com
250-mail.example.com
250-PIPELINING
250-SIZE 30720000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN DIGEST-MD5 PLAIN CRAM-MD5
250-AUTH=LOGIN DIGEST-MD5 PLAIN CRAM-MD5
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
MAIL FROM:<test@example.com>
250 2.1.0 Ok
RCPT TO:<user@example.com>
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
Subject: Testnachricht

Das ist ein Test.

.
250 2.0.0 Ok: queued as 83398728027
QUIT
221 2.0.0 Bye
Connection closed by foreign host.