Martin Brennan 0783bfbbfe
FIX: Use login SMTP auth for office365 in group mailer (#27931)
Followup 7b627dc14b934430f62a59fbcf09b0595ee94567

In this other commit, I changed the email settings validator
to always use the `login` authentication method for
office365 and outlook, but I didn't change the actual
group SMTP mailer to do this.

This commit fixes that issue and does some minor refactoring.
2024-07-16 16:21:14 +10:00
..
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