What's the alternative? Hosting it yourself means you now have a second full time job, which you will most likely do poorly, creating a lot of risk for yoursel

What's the alternative? Hosting it yourself means you now have a second full time job, which you will most likely do poorly, creating a lot of risk for yourself. It will also break at the most inopportune time, forcing you to spend time on it right then (within a window of a few days) or lose mail. You will also most likely host it on a rented server, which means you'll have just as much, if not more, attack surface than with email-as-a-service. As a package maintainer of anything reasonably important, you at least have access to "twitter support".