[stunnel-users] stunnel and Calypso: pop3 works, smtp error!

[greeksalad]

Hallo Everybody!

trying hard to get stunnel worked with Calypso email client!
When I only check emails, it works via stunnel at ssl port 995.
But sending email fails with following message from Calypso:

*** Sending pending mail from account xyz at gmx.net' @ 13.12.2013 01:54 ***
Connecting to: '127.0.0.1' -> Successful
Logging into the SMTP server as: "xxx"
The server does not support any secure password authentication providers
Disconnecting -> Successful
Failed to send one or more pending messages.
Smtp.c[287]  Smtp.dll

the config file via stunnel looks so:

cert = stunnel.pem
[gmx-pop3]
client = yes
accept = 127.0.0.1:108
connect = pop.gmx.net:995
[gmx-smtp]
client = yes
accept = 127.0.0.1:107
connect = mail.gmx.net:465

the mailserver- config of Calypso is so:

pop3: 127.0.0.1 port 108
smtp: 127.0.0.1 port 107
smtp authentication method: user pop account....

So, I am really out of ideas to get the very best email client of the  
world - CALYPSO - running to send emails via ssl connection, wich my  
provider forces me to send via ssl from 1.jan.2014...

Anyone can help?
thanks allot!
johann