Just as an aside, I can't send mail on Port 25 now

An unknown error has occurred. Subject 'test on Port 25', Account: 'Keith Which', Server: 'mail.skyusermail.com', Protocol: SMTP, Server Response: '421 Cannot establish SSL with SMTP server 77.240.11.49:465, SSL_connect error 336031996', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67

This is the old AVAST anti virus problem. Mail shield scanning, disable outbound shield solves it.

Fixed by making an adjustment within Avast. All is now well.

Thanks for your patience with this Ged.