I'd like to be able to filter based on email header data. Very specifically, I've run into issues with email loops due to autoresponders and most email providers will include header values (X-Autoreply: yes and/or Auto-Submitted: auto-replied) when the email is an autoresponse. This would help to eliminate the problem without having to turn off our osTicket confirmation emails.
Feature Request: Ticket filters based on email header data
Since I use a google email account for osTicket, and am a gsuite admin, I was able to put the osticket email account into a custom google ou and use a compliance rule that rejects auto-replies (based on the aforementioned header tags) ... But it would still be nice to have this feature baked into osTicket for this and other reasons.
There are a couple email meta filters that you can do currently, but yes I agree expanding that would be a nice way to flesh out the filters some more.