The configuration of an email client should look like this:

Incoming mail server: sarah.webhoster.ag (e.g. server)
Outgoing mail server: sarah.webhoster.ag (e.g. server)

User: Your email address
Password: the password to your email address

Select authentication via "Password/Password normal"!

Ports for IMAP:

Incoming mail server: 993 + SSL/TLS encryption
outgoing mail server: 465 (or 587) + SSL/TLS encryption


or ports for POP3

Incoming mail server: 995 + SSL/TLS encryption
outgoing mail server: 465 (or 587) + SSL/TLS encryption