This software sale is a good one at $12. Email Archiver turns all your emails into PDF’s. This is a great way to ensure your emails are always with you. I find that my email is like a database repository with receipts now for purchases for all kinds of things
Expect the first archive, especially if you have a lot of email, will take some time. From thereon in it’s fairly fast. Your email is really searchable with Spotlight at this point. I use HoudaSpot as a spotlight enhancer and this software works incredibly well.