I also gave up running my own mail servers.
But one thing to remember: under US law e-mail that has been lounging on your email provider's machines for 180 days or more is subject to warrantless retrieval by the Feds.
"Under the law, the government does need a warrant to access the content of electronic communications that are 180 days old or less, but doesn't need one for older emails. "
https://www.aclu.org/news/national-security/government-reading-our-email-texts-and-ims-without