In our group we are using suse and
Postfix SMTP server. Every thing was fine until last month when we
restart our mail server and also firewall.
The first problem is that when we use
Thunderbird with security and Authentication it is impossible to send
a email. we receive this error “Unable to authentication to SMTP
server ...”. however , it is possible to send email without
Authentication in local network.
The second problem is that we can not
send email via Thunderbird from outside of our local network.
The error is “Mail server responded
5.7.1 ..”.
we also have web mail (Squirrelmail)
and it works without any problems everywhere.
I completely confuse without change
anything these problem happen.
I was wondering if someone could help
me.
P.S : I am a beginner in postfix so please tell the solution with details. If
you need more information tell me.
