I did a mailing and the program did not set the envelope adress correctly. So a lot of mails didng go through.
Now I am looking at the mail log and try to find out which mails I need to re-send.
The error codes seem to be somewhat ambigous so I looked at the stat= field.
I found out that the following different values occour:
Sent (-some-message-id Message accepted for delivery) Sent Queued Deferred: 451 MAIL FROM: <email@example.com> Unable to verify MX-Record for domain ip-10-48-213-66.eu-west-1.compute.internal Deferred: 450 4.1.8 <firstname.lastname@example.org>: Sender address rejected: Domain not found Deferred: 421 invalid sender domain 'ip-10-48-213-66.eu-west-1.compute.internal' (misconfigured dns?) Service unavailable User Unkown Data Format Error Host unknown (Name server: some-server.com: host not found)
Which do i need to parse out to know which emails didnt go through and need to be re sent?
Invalid sender domain sounds to me like a permanent error. But why is it "Deferred" then?