Emails with no proper from headers are being received-ignored

[Wyatt Fudal1]

We are migrating to Microsoft Teams VOIP system. When the service desk misses a call, the voicemail generates an incident. The issue we are running into is that the email is received by the system but ignored. The reason the from_header is a phone number.

What would be the workaround to make this work? 

 

Error string: Email set to ignored because of disallowed from address, email_address_filter_reason = Missing final '@domain' 

[Tony Chatfield1]

Hi, from your screenshots\limited diagnostics the issue maybe that the user is unknown and so the email is ignored.

The best solution for this would be to fix the issue on the generating platform (or source email system) so that the email is send from a valid user and with proper headers.
You might be able to utilize a before insert BR on sys_email table to update the message IE set a suitable user and headers, potentially you could also allow your instance to accept (and process) email from unknown users,
but both of these solutions are less than optimal and fixing the source is the better option.