So I have one user that keeps getting SPF error message, this turns out to be a red herring and actual issue is user is forwarding email to another domain.
When doing this it breaks
More documentation here:
My question, How can I set this up on main in a box? the example email@example.com is forwarded to firstname.lastname@example.org but everyone sending emails to email@example.com is getting bounced away
550 5.7.1 Recipient address rejected