Install pCloud plugin for Thunderbird and your files (upto 20 GB free storage included) will be received as download links
The app design of Mozilla Thunderbird has not changed significantly since its beginning, making its learning curve almost non-existent.
Mozilla Thunderbird offers a huge amount of extensions to expand the usability and options of the client.
Mozilla Thunderbird offers a flexible filtering system with the ability to set flags and read/unread, as well as sort/assign to new mail directories. There are also numerous plugins available to assist in the filtering.
Thunderbird's interface is very outdated and unpleasant. It feels more like a Windows XP application than like a modern MacOS one.
Mozilla Thunderbird has slowed down its development of features to only focus resources on security and stability.
Even though it was first released in 1995, Mutt still enjoys an active community following it and having new releases constantly.