I really thought I had suggested this before, but if so it was years ago, maybe even on the old community platform. We are using SM Build 9014 (Sep 5, 2024) So not sure if this has been implemented in a newer version yet. BUT...

I want the ability to search email by content of the headers - from a personal email account. Yes, as the super duper system admin I can search the SMTP logs, but that is not going to work for the average user or domain admins.

I would like to see as an added search criteria in either the basic search or the advanced search an options for "headers" and then be able to search various header info.   This way when we get spam, and I blacklist an IP range, I can search though all of the spam email and filter out and delete all of the ones from that IP address/range. And also search through all of our other folders and see if some scammer slipped through to a different mailbox because of filter rules.

This would be useful for searching for IP Addresses, Domains, return Path, Reply-To, Etc.  But this woudl REALLY be helpful in tracking down trash