[CentOS] Timeout when downloading messages

> So, not to ask the obvious question here, but what do the logs say?
> org/mailman/listinfo/centos
> Logs for my dovecot and postfix seems to be ok. Sending is not a problem so
> it means my Postfix works well. My receiving services is the problem. Cant
> find any error logs on my mail server.

Iptables rules getting in the way?  anything unusual in /var/log/messages?

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"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety''
Benjamin Franklin 1775