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Mail Relay Service

CNS Network Services offers a mail relay service that will relay mail on behalf of other machines, devices, and applications that are unable to use authenticated SMTP for mail sending. This document outlines the guidelines for using that service and provides the settings for the service.

About the Mail Relay Service

CNS Network Services offers a mail relay service that will relay mail on behalf of other machines, devices, and applications that are unable to do authenticated SMTP for sending mail. To prevent unauthorized mail from being relayed, the service will only accept mail from a list of approved IP addresses.

Departments must register their IP address(es) with the service in order to use it.

The mail relay service is intended to relay legitimate UofT mail, such as that from UofT networking devices that send automated mail but that do not support authenticated SMTP, from UofT servers that cannot queue mail locally, from UofT servers that generate automated messages, and other similar devices and servers.

The mail relay service is not intended for use by personal workstations or applications that support authenticated SMTP. It is also not intended for relaying unofficial, unsolicited bulk mail.

CNS Network Service manages the mail relay service and reserves the right to block access without notice from any IP number that disrupts mail delivery or violates UofT IT policies and guidelines.

Registration Form for the Mail Relay Service

If your department would like to register to use mail relay service, please copy and paste the following text into your mail client, fill out the form and send it to network.services@utoronto.ca.


Your Department:
Contact E-mail Address:

MailRelayRegisteredSuccess

After You Have Registered

  1. You will receive an e-mail message confirming that your IP addresses have been registered.
  2. Please configure your newly registered machines so they use the mail relay service for sending mail. The machine name for the mail relay service is devicesmtp.utoronto.ca. You can direct the mail to port 25.

Additional Support For further help with the mail relay service, please send e-mail to network.services@utoronto.ca

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Page last modified on April 08, 2010, at 05:21 PM