When comparing Postbox vs Canary Mail, the Slant community recommends Canary Mail for most people. In the question“What are the best e-mail clients for macOS?” Canary Mail is ranked 6th while Postbox is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pro One Inbox for all accounts
All messages in one place. But you can select to show only messages from each account either.
Pro Quick Bar for macros
Quick bar allows you to add a variety of content to your message. It will let you reuse URLS in your Sent folder, and autocompletes against canned responses, signatures, and topics.
Pro Pretty Good Privacy or PGP built-in
Pro Gorgeous and intuitive
Pro No personal data stored on servers
No access tokens, passwords, attachments or email itself is stored on Canary servers.
Pro Local email database is encrypted on disk
Canary stores your local email database encrypted.
Con Way too expensive
Currently the price is at 45€. That's ridiculous for an E-Mail client. The design alone is pretty but neither does that or the functionality in any way justify the pricing.
Con Poor text editing capabilities
The cursor is laggy so you're better off using keyboard shortcuts.
Con Windows moves randomly
When you create a new email, the new windows is often misplaced so that you have to move it to reach the "Send" button.
Con Poor handling of new emails
You sometimes need to wait very long before your email actually gets delivered.
Con Show NO show
It'll show I have new email as a counter but I'm not able to view them.