Hi!
I've set up oauth using the following guide; https://www.znuny.org/en/blog/modern-authentication-with-microsoft
Inbound email works as expected though outgoing email throws an error regarding SMTP auth.
ErrorMessage: 535, 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is ...
Search found 1 match
- 13 Aug 2025, 17:42
- Forum: Help
- Topic: Can't figure out sending through M365
- Replies: 2
- Views: 25890