Hello !
English is not my first language but I'm goingo to do my best effort (i'm sorry for the mistakes).
In our company we had a particular situation with a e-mail message that was sent to three users and only to one of them the message reached the inbox.
We looked in the audit logs for messages rejected using the IP and we found some messages Rejected by MTA, but we couldn't look for all messages rejected by MTA for all IP Addresses because it's necesary to put an IP address if you want to see this kind of messages.
The idea is to make an option that allows to see all messages rejected by MTA without specify a particular IP address.
Thank you.