How Can I Fix - I am trying to link up my 1and1.co.uk email account to Windows Mail. Incoming mail is working but sending just won't work.?

I am trying to link up my 1and1.co.uk email account to Windows Mail. Incoming mail is working but sending just won't work.

I am trying to link up my 1and1.co.uk email account to Windows Mail.
Incoming mail is working (it's a miracle!!) but sending just won't work.

If anyone has any suggestions, I'd appreciate some feedback.
This is the error message I received:

The host 'smtp.1and1.co.uk' could not be found.
Please verify that you have entered the server name correctly.
 Subject '', Account: 'pop.1and1.co.uk', Server: 'smtp.1and1.co.uk', Protocol: SMTP, Port: 25, Secure(SSL): Yes, Socket Error: 11001, Error Number: 0x800CCC0D

Thanks
Original title: Sending mail...help!

Anwsers to the Problem I am trying to link up my 1and1.co.uk email account to Windows Mail. Incoming mail is working but sending just won't work.

Download Error Fixer (Free)

Server Type: POP3
Incoming Server: pop.1and1.co.uk
POP3 port: 110
POP3 port with SSL enabled: 995

Outgoing Server (SMTP): auth.smtp.1and1.co.uk
SMTP port: 25 or 587
Outgoing server (SMTP) requires authentication (user name and password)
Optional: Secure SMTP encryption using TLS (using either port)
Account name/User name: Your full 1&1 e-mail address
Password: Your e-mail account's password
 
*********************************
 
Try port 587 with authentication checked.

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