because ther you can't see anything cause TB doesn't even get there to my server.
maybe so, but it doesn't hurt to check the logs for confirmation. you can look for postfix logs
of connection attempts. they should be in lines containing "postfix/smtpd", i think.
edit: on the windows side (which i don't know very much about), if you can't
connect after turning off the virus scanner (which can prevent
TLS connection), you can diagnose the problem by looking at a wireshark