IMPORTANT: Nylas Mail is no longer maintained
Nylas Mail is no longer maintained by Nylas - nobody will read or respond to issues filed here. This issue tracker is being kept online because many existing issues contain valuable tips and information.
If you're looking for an alternative to Nylas Mail, check out https://getmailspring.com/. It is based on the Nylas Mail source code, maintained by one of the original developers, and features an entirely re-written sync engine.