Then the e-mail will get forwarded onto firstname.lastname@example.org. Regroup rejects any e-mails with out a MX record.
Not possible in 365.
That command only applies with Edge Servers
This cmdlet is available or effective only on Edge Transport servers in on-premises Exchange.
365 will rewrite forwarded messages in the following scenarios:
But its not something you can control . Atlassian should send those messages from a legitimate domain with a mx record.
You could try Power Automate and see if that works for you.
GIve your self SEND AS to the shared, not Send on Behalf
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