[Osiris]

Source Claws Mail: The unsung powerhouse email client

have used so many email clients over the years. For the last few years my go-to email client has been Thunderbird. Lately, however, I have really been taken in by Claws Mail. Claws Mail is an email client for power users looking for more than just your average email client. Claws Mail has more features than the average email client and is just as reliable as anything you have used.
Claws Mail is based on GTK+ so it will install on nearly any Linux machine running X Windows. It features:
Multiple Accounts
Threaded Display
Filtering
IPv6 support
Mbox import/export
Clickable URLS
Addressbook
Granular configuration
Pre and Post processing filters
Redirecting
SSL Certificate Manager
Address Harvesting via folder or messages
And much more.