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Authenticated SMTP

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As an anti-spam measure, the Informatics mail servers do not allow normal mail connections from outside Unfortunately, this also stops legitimate Informatics staff and students from sending mail from their home machines (or laptops or mobiles) via our mail relays. One solution was to use the IS VPN service or the user's local ISP mailrelay, but this required the user to reconfigure machines/email clients just to send mail.

A Better Solution - Authenticated SMTP

Most email clients support authenticated SMTP. This allows the user to authenticate to the mail server to say who they are, and once confirmed as a valid user, the mail server will allow the user to send mail, even though they may not be within the local network.

IS offers authenticated SMTP for both staffmail and Office 365 users. You should use the SMTP server for the service your mail is located on.

The School also provides an authenticated SMTP server for mail clients to connect to. The basic details are as follows (note that the "Server Name" is sometimes referred to as the Outgoing Server or SMTP Server):

Server name:
Port: 587 (sometimes known as submission port) - use STARTTLS setting
or Port: 465 - use SSL setting

The reason we don't use port 25 is that this is firewalled and cannot be accessed outside of, and even then does not allow unauthenticated relaying.

Email clients supporting SSL should use port 465, those supporting STARTTLS should use port 587 (eg Thunderbird - though it supports both).

If your client supports Kerberos then this is supported too (eg Thunderbird with MIT Kerberos for Windows, or alpine on Linux).

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