[SOLVED]SMTP Problem

[Martini]

Hello.

I have a strange problem with my postfix. When I connect to my server using web interface, everything is fine - I can receive and send messages, but when I do the same thing on a mail client, such as Outlook and Outlook Express, I can receive my mail both in SSL and non-SSL mode, but I can only send using non-SSL SMTP on port 25, when I try to use SMTP-SSL on port 465, the client stalls - it is trying to validate, and then eventually quits. I don't know why SMTP-SSL doesn't work - ISPCP shows all smtp daemons UP. On the other hand however I don't see line STARTTLS when I send ehlo localhost command to postfix.
Please advice,
Martini