We are phasing out Zendesk. Please see Discourse instead: https://community.getmailspring.com/t/gmail-categories-or-bundles/302
Unfortunately, Google's APIs and IMAP implementation do not provide third-party mail clients with access to the special filtering features within Gmail or Google Inbox, including:
- Social, Promotions, etc. categories within Gmail
- Priority Inbox
- Bundles, Highlights and Reminders in Google Inbox
We may implement similar mail organization in the future on our own, but it's unlikely that Google will improve third-party support for these features.