Ur-Sltn Email client settings:

IMAP/POP3
hostname: mail.ur-stln.net
Port: 143
Use SSL: True
Username Format: [email protected]

SMTP
hostname: smtp.ur-stln.net
Port: 587
Use SSL: True
Use Authentication: True, use same user/pass as IMAP/POP3
Authentication Type: Password
For thunderbirb use 'encrypted password' not plaintext

For Android devices:
hostname: smtp.ur-stln.net
Port: 587
Use TLS
Reuqire-sign in must be checked