i have am getting alot of NDR, i enabled logging for the IMC and it reports
The following message could not be delivered to <firstname.lastname@example.org>
The destination server reported:550 Administrative prohibition from <> subject:test
I also get the same message with 550 relay not permitted.
i am receiving mails fine and also able to send mail fine. i think this is caused when the receipient requests delivery receipts. Problem started a week ago.
Any ideas ?
I tried configuring the IMC to send mail through DNS, which worked fine but were then recieving outbound mail failures to certain addresses.
Thanks in advance for all your help.