SMTP + Microsoft 365
Start with the problem you actually have.
Exact errors, application constraints and migration decisions. Each guide checks the simpler Microsoft-native route before adding another relay.
Guides
Specific answers for stubborn SMTP dependencies.
Printer · OAuth
Your Brother printer can't use Microsoft 365 OAuth. Do you have to replace it?Check the exact model first, then choose where the printer should send SMTP.
Kyocera · 1102
Kyocera error 1102 with Microsoft 365: find the failed loginSeparate authentication failure from DNS, timeout and TLS errors before changing the relay.
Core references
Making a relay decision?
These pages own the reusable Microsoft 365 and SMTPReady requirements and trade-offs. Guides link here instead of copying them.