Thunderbird is a free open-source email client that is installed on most Linux distributions by default. It has been around for a long time and it’s one of the most popular email clients for Linux.

Thunderbird is a popular email client that has been around for over a decade. But with the rise of web-based email, it has fallen out of favour with many users.

There are plenty of alternatives to Thunderbird for those who want to replace their current email client. Some alternative options are:
1)Mailtrim
2)Mailbird
3)Outlook
4)Mailbird
5)Postbox