Thank You for Your time and answer, Wietse and other people who have answered me:
> Anti-virus software is known to do these things, because it would > not be able to decrypt the traffic. The software may be running on > the client, on the server, or on a firewall. Please, if You say that, tell me how I can illuminate this! For I especially did not set any of above: no antivirus software - except w/ postfix/amavis/spamassassin/clamav by default, nor iptables - the rules are simple only allowing the 25 and 110 ports. How I can figure out the problem if this be the case? Thank You. again.
