Support for Modern Authentication with Office 365 for email delivery

[winseng]

Description

Microsoft Office 365 is moving away from support Basic Authentication protocols and in the future will only support Modern Authentication. While they will still allow SMTP, they highly discourage its use due to being insecure. It would be great to see SecureDrop integrate with Modern Auth for O365, as O365 is a mailing provider for many organizations.

User Research Evidence

https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-september-2021-update/ba-p/2772210

User Stories

If appropriate