The email app that comes with macOS, simply known as Mail, is a decent email client for most users. However, it lacks some of the advanced features that power users may be looking for. Fortunately, there are several third-party add-ons available to enhance Mail and make it more productive. Here are the 11 most popular macOS Mail add-ons that you should consider:

1. Airmail

Airmail is a popular third-party email client for macOS that offers a clean and customizable interface, along with several advanced features. With Airmail, you can snooze emails, schedule emails to be sent later, customize swipe gestures, and more.

2. MailButler

MailButler is a productivity add-on for macOS Mail that adds several advanced features to your email client. With MailButler, you can schedule emails, undo sent emails, create email templates, and more. It also integrates with several third-party productivity tools like Trello, Asana, and Evernote.

3. Boxy Suite

Boxy Suite is a minimalist email client for macOS that offers a clean interface and several advanced features. With Boxy Suite, you can customize the look and feel of your email client, snooze emails, and schedule emails to be sent later. It also integrates with several third-party services like Dropbox, Google Drive, and Slack.

4. SpamSieve

SpamSieve is a sophisticated spam filtering add-on for macOS Mail that uses advanced algorithms to filter out spam emails. With SpamSieve, you can train the add-on to recognize specific types of emails as spam, and it will automatically move them to your spam folder.

5. MailTags

MailTags is a productivity add-on for macOS Mail that adds several advanced features to your email client. With MailTags, you can tag emails with keywords, create custom smart mailboxes, and more. It also integrates with several third-party productivity tools like Devonthink, OmniFocus, and Things.

6. MailMate

MailMate is a powerful email client for macOS that offers a wide range of advanced features. With MailMate, you can customize the look and feel of your email client, snooze emails, and schedule emails to be sent later. It also offers powerful search and filtering capabilities, along with support for Markdown and other advanced formatting options.

7. MailHub

MailHub is a productivity add-on for macOS Mail that adds several advanced features to your email client. With MailHub, you can sort emails into folders automatically, create custom email workflows, and more. It also integrates with several third-party productivity tools like Trello, OmniFocus, and Things.

8. Mail Act-On

Mail Act-On is a productivity add-on for macOS Mail that adds several advanced features to your email client. With Mail Act-On, you can assign keyboard shortcuts to common email actions, create custom mailboxes, and more. It also integrates with several third-party productivity tools like OmniFocus, Things, and Evernote.

9. MailSteward

MailSteward is an email archiving add-on for macOS Mail that allows you to archive and search your email messages. With MailSteward, you can archive your emails to an external hard drive, search your archived emails, and more.

10. MailTab

MailTab is a simple add-on for macOS that adds a menu bar icon for quick access to your email client. With MailTab, you can quickly check your email without having to switch to your email client.

11. GPG Suite

GPG Suite is a security add-on for macOS Mail that allows you to encrypt and sign your email messages. With GPG Suite, you can protect your email messages from prying eyes and ensure that your messages are authentic.

In conclusion, these 11 macOS Mail add-ons can help you enhance your email productivity and make your email client more powerful. Whether you’re looking for advanced filtering capabilities, email archiving, or encryption and security, there’s an add-on out there for you.