"It's fast: Claws Mail has to be one of the fastest to open
applications I have seen in the Linux operating system. In the time
it takes Thunderbird to open I can have Claws Mail open and
composing a new email. It really is that fast.
"It's flexible: Claws Mail does what you want it to do. If there
is a behavior you do not like you can change it. And you're not
limited to the few configurations you have in Thunderbird. Claws
Mail has NUMEROUS options that can be tooled to precisely fit your
needs. You can even easily create templates in Claws Mail to handle
the formatting of your new mail, replies, and forwards.
"It's extensible: Claws Mail also has an easy to use plug in
system that allows you to include many other features. Yes,
Thunderbird has add ons galore, but with Thunderbird you are pretty
much limited to Addons to extend the features of the email client.
With Claws Mail you can use plugins, templates, scripts, actions,
pre/post processing rules, filters, you name it."
