1&1 webmail incoming mail server

The incoming mail server for 1&1 Webmail is:

Note: You may need to use the "imap.1and1.com" server for incoming mail, and "smtp.1and1.com" for outgoing mail.

Also, you can use the following settings for IMAP:

Please note that these settings are subject to change, and it's always a good idea to check with 1&1 Webmail support for the most up-to-date information.