Step 1: Enter your name, email address, and password and click on Continue:

Thunderbird will try to automatically grab the server settings, please compare to the picture below.
Step 2: After shows these settings, click on Manual Config

Step 3: Fix the Outgoing server to use No Authentication, then click Create Account

Note: if you are using a domain other than mcsnet.ca like hmsinet.ca, please specify the full email address
in the 'User Name' field.
Step 4: Once Thunderbird has digested your settings, it will give you a warning message about email not being encrypted. Check the 'I understand the risks' box and click create account to finish:

Click on Tools then Account Settings:

Click on Outgoing Server, then Edit...:
Change Authentication Method to No Authentication
Click OK to get out of the menus, and the fix is done.
Keywords: thunderbird