I'm trying to send an email from Windows Live Mail and the emails won't send. The following message keeps coming up: 

An unknown error has occurred.

Subject
Server Error: 421
Server Response: 421 Cannot connect to SMTP server 89.238.162.71 (89.238.162.71:25), NB connect error 1460
Server: 
Windows Live Mail Error ID: 0x800CCC67
Protocol: SMTP
Port: 25
Secure(SSL): No

How do I fix this??