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144: How do I configure Thunderbird for Mines Exchange email?


Here’s how to configure the popular email client Thunderbird ( for use with Mines Exchange email and Office365, which is used by Mines faculty, staff, and a few others on campus. Thunderbird has the distinction of being available on Windows, macOS, and Linux.

These instructions do not apply to student MyMail and Thunderbird.

Because Thunderbird likes to guess at account settings during setup — and is often wrong — you may need to manually enter the data. Here’s how:

In Thunderbird, click Tools > Account Settings > Account Actions > Add Mail Account (or if you are starting Thunderbird for the first time, just click the button to configure a new account).

Enter your actual name, Mines email address, and MultiPass password.  Click Continue then Manual Config while Thunderbird is testing settings. You don’t need to wait until the test is completed.

Here are the settings you should enter:

IMAP (incoming email)
Port:  993
Encryption Method:  TLS
SMTP (outgoing email)
Port:  587
Encryption Method: STARTTLS

You can also configure Thunderbird to use the POP email protocol, though it is not recommended by CCIT. Use it at your own risk and only if you know why you are choosing POP instead of IMAP.

Port:  995
Encryption Method: TLS

Your username in both cases is your full Mines MultiPass username:

Click Done.

Now check the Outgoing SMTP server configuration to make sure it is as needed:

Click on Outgoing Server (SMTP) and click Edit to change the Outgoing server settings.  Change the port from 465 to 587 if necessary. Click OK then OK again.

Click Get Mail at the top left hand corner of your Thunderbird application. Your mail should start appearing in the left-hand column. 



Having difficulties? Bring your laptop to the Mines Service Center (CT156) for some in-person help. (You may want to call 303.384.2345 first to set up an appointment.) Or submit a support request to Mines Help Center at

Thunderbird is a capable Exchange calendar program as well, though a number of plugins and some fairly involved configuration are necessary. Configuration of Thunderbird to work with Exchange calendar is the subject of a different FAQ item: