Many ISPs have started blocking outgoing e-mail through third party mail servers on the standard SMTP port (port 25) in an effort to prevent abuse by malicious spammers. Due to this, it may not be possible for you to send e-mail through your mail server using the standard SMTP port. We have configured the mail servers to accept unauthenthicated SMTP connections on both the standard port and an alternate port in order to allow you to use your mail server to send outgoing e-mail through your server.

If your ISP blocks port 25, check your e-mail application to see if it allows user configuration of the outgoing mail server SMTP port. Most modern e-mail application do allow you to specify the port number to use. If your e-mail application allows this, change the port number to 5190. Otherwise you will need to use your ISP's SMTP server to send your outgoing mail.

In addition to unauthenticated SMTP connections, you can also use SMTP Authentication on either port 25 or port 587. In order to use this you will need to set up your mail application to use smtp authentication with your mail username and password.