We have a solution where we have setup the SMTP settings with server: smpt.office365.com / port: 587 / authentication: Plain / TLS / We use an actual mailbox account to sign in with the appropriate username and password however we get an error 1507 back from FileMaker.
The user signs in from the office365 web interface with the username and password.
I have looked through the various community posts over the last couple of years and there are various similar issues with some people saying there is a problem with how FM authenticates against office365.
Is there anyone who is successfully using an Office365 SMTP server? If so with what connection settings?