Originally Posted by make-fun
There also seems something strange about trying telnet
telnet localhost 25
Connected to localhost.
Escape character is '^]'.
220 my.server.net ESMTP Postfix (Ubuntu)
then my ssh connection freezes and I need to start a new session…
This is normal - it's waiting for input from you, something like
Are you using the correct username in your email client? web1p9 doesn't seem to be correct - ISPConfig uses underscores, so maybe the correct username is web1_p9?