I create a mail-in-a-box recently and I have this issue:
I can receive mail with some delay, some minutes (from other external emails)
But I cant send any mail, appears like he send, but the other mail never recipes.
I was searching in this forum but nothing looks like my problem.
Investigating from the forum, I found one interesting.
Seens the MIAB will find first his domains (inclusive if doesn’t work) and send emails to this domains.
I’m migrating all my domains to this so I created all domains in my MIAB. Thats why don’t work send emails.
My solution was deleting the domains and emails work again.
Now I have to create domains and configure 1 by 1.