Mailstache will be ending services on November 1, 2016 at 12:00 AM MST. All account data and email will be completely deleted and disks will be wiped clean.
Mailstache started out as a side project for myself in the fall of 2013. At the time I was just closing down a previous side project and looking for something new. While developing the previous side project, I realized there wasn't a service for developers that offered basic free email hosting. All I ever needed was hosting for my personal domain and for whatever side project I wanted to take on. I completed developing the initial beta in the winter of 2014 and launched to relative fanfare.
However tough times fell on Mailstache as I was forced to steer my attention towards a job that provided actual income. This caused a major delay in features and improvements to the service. Finally we arrive at "now" where I've decided to no longer keep running the service.
You have until November 1, 2016 at 12:00 AM MST to export your email. If you are using Thunderbird and plan to run your own server in the future, you can export your email into mbox format by installing the ImportExportTools extension. Mbox is a popular format that is compatible with the Dovecot IMAP server.
If you'd like to move your email hosting to another service, then you may enjoy Fastmail.com. Fastmail is a top teir service that offers all the features of Mailstache plus more, such as CalDAV and CardDAV (respectively calendar and contact syncing). They also offer an email import function that works wonderfully with Mailstache. More details can be found at Fastmail.com.
Whatever you decide, once you complete your email migration and verify everything is working as expected, it is advised that you delete your email accounts from the Mailstache dashboard. This will prevent any further email from being accepted into Mailstache's systems.
Finally, I'd like to thank all the free tier and paying tier customers over the last 3 years. Without you, this project wouldn't have made it out of conception. Special thanks to all members of the IRC community who helped assist and educate customers through the years as well as keep the ol' #mailstache warm and cozy. Thank you and good luck in your future!