I cannot "Send" from Windows Live Mail 2012 and get the following message.

An unknown error has occurred.

Server: 'smtphm.sympatico.ca'
Windows Live Mail Error ID: 0x8007007A
Protocol: SMTP
Port: 25
Secure(SSL): Yes

Incoming mail is OK.

My setting have not changed & I have ben using the program for a number of yearss