secure smtp with XMail,stunnel - outlook sucks

[romee]

Hi,
I've setup pop3s and ssmtp with Xmail 1.20 and stunnel 4.05. I have no problem with pop3s but ssmtp (I used the standard ssmtp port 465/tcp but I've tried also the 8025 and 25) is not working with any of the outlook mail clients on windows systems. My thunderbird client on my gentoo box is working perfectly, even thunderbird on windows worked with no problem. While sending, outlook gives me a 0x8004210B error. I've searched around google for this error and I've found that it could be a outlook's fault. As I can't tell everybody in our company to get thunderbird, I've to resolve this somehow.