Totally fair. This is probably the biggest limitation right now.

I started with the Gmail API because: - better performance vs IMAP for large mailboxes - easier access to size metadata per message

That said, IMAP support is something I definitely want to add. Especially for iCloud/Outlook users.

If I did add IMAP, would you be okay with: - slower scans - slightly less accurate size estimates

Or is parity with Gmail important?