This soft fork has a slew of features and bug fixes that may or may not ever make it to Thunderbird. If you’re not sure about switching, you can run it on the same profile.

Strip out the spy pixels that come in your email from marketers, and find out who is tracking you.

From the makers of Firefox, an open source email client that features tabbed browsing, filtering and timeline tools, plenty of customization, and robust security measures.

Use your inbox as a to-do list. Email starts in Low Priority. You can click on Remind to send it to a built-in calendar or To-Do to send it to the Inbox, where it stays until you mark it Done.