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Set Up E-Mail Clients Using IMAP or POP3

1&1 suggests the use of IMAP over POP3.

The Account Name/User Name is your full 1&1 Mail Basic address. You created the Password during your E-mail account setup.

Setting IMAP POP3
Incoming Server
Port with SSL enabled 993 995
Outgoing Server (SMTP)
Outgoing port with TLS enabled 587 587
Outgoing server requires authentication
(user name and password)?
Yes Yes
For additional information, you may want to reference: