After trying every Mac email client out there, Kiwi is my choice

Im a heavy Gmail user, both for my personal and work email. I literally get 1000s of emails in my work account every day (alerts, support email, etc.) so most IMAP-based clients are not able to keep up with it.

I have tried pretty much every mail client out there, from Mail (rubbish!), to Outlook (horror!), to AirMail (acceptable), to having Gmail open in Chrome. While it not the most beautiful or elegant app out there, Kiwi does the job better than all.

Kiwi lets you keep the "native" Gmail interface, which does all the heavy lifting on Google servers, while integrating with system notifications and having a menubar icon.

Svintus about Kiwi for Gmail, v1.8.87