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I installed Fedora 11, text mode, Mail Server group included, and I tried to exchange e-mails with my accounts at yahoo.com and gmail.com. It does not work.
I am using mailx as a Mail User Agent (MUA) and sendmail as a Mail Transfer Agent (MTA), with default settings.
I can see, with tcpdump, tcp packets going to ...yahoo.com:smtp and google.com:smtp, but there is no response.
iptables: I tried iptables and tcpdump, and I believe that tcpdump listens outside iptables, that is, it sees packets after they leave and before they enter. Anyway, there are some iptables logs which show nothing.
Plese give me any idea, because I am stuck. I even read somewhere that it is possible that my ISP stops smtp connections, but I believe that this is not the case.
Thank you for your help.
Last edited by doru; 08-02-2009 at 12:29 PM.
Reason: improve English
I am reluctant to disable iptables, for security reasons. I hope I can verify other issues before I try this. On one hand, I believe that tcpdump sees outside iptables, so it should see any response. On the other hand, iptables is fairly complicated, maybe it does not identify smtp connections.
I tried both mailx and telnet smtp.google.com 25, both with and without iptables active, and there is nothing but a deadly silence. telnet says:
and there it dies. I hope 20s should be enough, to wait without iptables, for telnet?
Sorry for that, I got it from Google Settings for Email client. Since that was the only one I now after trying to configure smtp.gmail.com on port 25 in the past with resulting in errors on Outlook, Thunderbird, and so on, ... I assumed that port 25 would not be listening.
I'm sure however that my server at work is NOT connecting on port 25 to Gmail for enterprises.