Outbound SMTP Auth
Outbound SMTP authentication is achieved by extending the ISP SMTP host entry in either the Outbox/Delivery page or a Remote Domain/Delivery page. Outbound authentication is not available when using MX delivery options.
The format is:
host address[:host port][;login id;password]
e.g. mail.isp.com:25;fred;mypassword
bracketed items are optional.