UofT made some changes recently with authentication, disabling what they’re 
calling “legacy authentication”.  These days, it’s OAUTH2 or you’re stuck with 
webmail.  First, you need to ensure that you’re using Thunderbird 77.0b1 at the 
minimum.  Then, you can follow the instructions in the email they sent about 
this in March: 
https://its.utoronto.ca/improving-information-security-by-disabling-legacy-authentication/

> On Apr 17, 2022, at 21:06, William Park via talk <[email protected]> wrote:
>
> To those with @alumni.utoronto.ca email account,
>
> I have an old UofT account, and I'm trying to set it up in Thunderbird.
>
> (1) Getting Email:
>
> I can download via IMAP.  But can't via POP3.  Is it same experience for 
> other people?
>
> (2) Sending Email:
>
> I can't send email via their SMTP server.  Thunderbird asks for password 
> which errors out.
>
> ---
> Post to this mailing list [email protected]
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