> Some emails I send are sensitive, and I’d rather not forward it to a third-party service if I don’t have to. However, those sensitive emails are often important, so I need a way to remember to follow up.<p>I feel this pain.<p>Shameless plug: I wrote an open-source version of Boomerang/Followup.cc that is designed to be self-hosted, specifically because of this concern: <a href="https://github.com/ChimeraCoder/go-yo" rel="nofollow">https://github.com/ChimeraCoder/go-yo</a><p>(For the record: I like script in the original submission script, but for me, I rarely use the Gmail web interface, so I had to make something that works over IMAP).<p>It's still a WIP, but I've been using it myself for the "bounce-back" feature for the last several months.