Thunderbird is #3 in Top 10 Email Clients
Thunderbird is a Mozilla's free email application that's easy to set up and customize - and it's loaded with great features
Positions in ratings
#3 in Top 10 Email Clients
Alternatives
The best alternatives to Thunderbird are: Outlook, Mailbird, Evolution, GMail, Spark, Postbox
See also:
Top 10 Email Clients for Work
Top 10 Email Clients for Work