I am always looking for help with specific issues and often come across helpful and unhelpful suggestions in help forums.
If you don’t know the answer to what is being asked, don’t show off showing what you DO know, that’s a waste of time.
Quick answer to what do you do is exim is acting “strange” or “weird” and you own the box it’s hosted on.
eximstats /var/log/exim/mainlog > /tmp/exim.stats
Now view /tmp/exim.stats
That will probably get you going on your way, and you’ll know what to google next!