Sthu Pous: > 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?
See my other reply. The server does not announce STARTTLS support. Wietse