Cant connect to smtp server

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http://serverfault.com – I have troubles connecting to an smtp server from my pc. I use Debian sid. telnet mail.example.com 25 Trying telnet: Unable to connect to remote host: Connection timed out While from another debian pc from outside my network telnet mail.example.com 25 Trying Connected to mail.example.com. Escape character is '^]'. 220 mail.example.com ESMTP Exim 4.63 Mon, 02 Apr 2012 22:14:09 +0200 ping hangs forever as well and when i hit ctrl+c it says 100% packet loss. finally traceroute is full of asterisks: traceroute mail.example.com traceroute to mail.example.com (12 (HowTos)