first off, thank you very much for your patience and help. I’m somewhat new to MIAB, so my struggles are showing.
I have set the SMTP user on Odoo back to firstname.lastname@example.org and it validates correctly.
I also created an alias in MIAB, email@example.com. I have selected the second option on permitted senders: “I’ll enter the mail users that can send mail claiming to be from the alias address.” and have added firstname.lastname@example.org and email@example.com to that list.
I can send an email from within odoo as firstname.lastname@example.org but when I try the other users, I get the “not owned…” error message.
Permitted senders is only an alias option, correct?