When setting up your computer or mobile device to access your IMAP email account, use the following settings:

Server Type: POP3

Incoming Server: pop.1and1.com

POP3 port: 110

POP3 port with SSL enabled: 995

Outgoing Server (SMTP): smtp.1and1.com

SMTP port: 25 or 587

Select option for Outgoing Server (SMTP) requires authentication (username and password)

(optional) Secure SMTP encryption using TLS (using either port)

Account name/User name:  your full email address (i.e. myname@mydomain.com)

Password:  your email account's password