Of course, there are many of them. Here is not full list:
The first free .onion accessible email service that was widely used was tormail.net / tormail.org during 2011-2013. Tormail was taken down by the FBI because it happened to be hosted at FreedomHosting (a free .onion web host) whose server(s) the FBI seized because FH was allowing other things like CP to be hosted. The FBI now has full access to all the non-PGP encrypted information that was on the tormail server when they seized it, and they have used their access to that information in multiple investigations. Remember this when using such email services.
- Request Membership. Leftist Political collective, anti-racism, fascism and misogyny
Autistici / Inventati
Request Membership - Socialist Political group
The Donald Express
Free, invite only
- Paid accounts only, responsive, agorist-friendly, competent support.
- Paid accounts only, responsive support.
- Very low-cost, paid accounts.
- paid accounts only, lacking support
- Don't even bother visiting this site. Their prices are insane.
If you want to connect to the .onion imap/pop3 and smtp servers for these providers in an email client, The TorBirdy Add-on for Thunderbird is an excellent choice that has been DNS leak tested.