But there are situations where this is not desirable and you need to use our SMTP server. (eg. smtp.yourdomain.com.au).
Since most ISPs redirect all traffic on the default SMTP port (25) to their own mail servers, you may need to use an alternate port in order to route your outgoing mail to our server.
If this is the case, these are the alternate ports to use:
Port 587 (Non SSL)
Port 465 (SSL)