Thunderbird is an open source, cross-platform email client and news reader developed by the Mozilla Foundation. It is designed to be powerful, yet easy to use and customize. It offers a range of features such as an address book, message organization, multiple account support, message search, message filtering, message tagging, spell checking, an integrated RSS reader, and an integrated calendaring system. It also allows users to easily share files with other Thunderbird users via an online file sharing service. In addition, Thunderbird also offers a wide range of add-ons and extensions which can be used to extend its functionality.
Maintains the style of working with email as it should be, as we are accustomed to proper desktop mail clients. Unlike modern and sophisticated clients, with a couple of buttons without even offering an option to view the headers.
Open source, stable, essentially bug-free, low resource requirements, just email with no extra "cool" features that you never use.
SeaMonkey is both a WEB BROWSER and an EMAIL CLIENT. It is the successor of Mozilla Application Suite or Netscape Communicator, resp. In addition, it also includes a news client program, an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla).
It has all the features of Thunderbird and many more.
Thunderbird is a mail application, SeaMonkey appears to be a web browser.
Thunderbird is brutal, emClient is clean, neat, well thought out etc. Works with Exchange, Gmail, etc. All in one installation. Drop in replacement for Outlook at a fraction of the price for business.
A good Windows alternative if you use 1-2 mailboxes or don't mind paying.
Playing HTML mail very slowly in Win10
I've used Thunderbird with IMAP for years, but the small font issue on Mac is now a deal breaker, and with my decades of emails and folders, Thunderbird is falling apart when searching or moving folders. Apple Mail does what I need it to: manage multiple Gmail accounts, not be too slow, and allow me to adjust the font size. The folder/mailbox layout in Apple Mail is not as intuitive as Tbird, but I can deal with that.
You must download all your emails and there is no option to limit it.
Mailbird lacks most of the features offered by Thunderbird, such as encryption and add-ons.
do not sort, do not show allmail for gmail
It is a good and light alternative, but the UI is clumsy and the composition of the HTML message is lost. You have been warned!
Much faster than the thunderbird that hides on weak machines.
Small and fast and not flooded with options!
The discontinued Opera Mail is no longer updated and is no longer supported, but the latest version, 1.0.1044, released in February 2016, can still be downloaded from the official website.
You need to create an account with a third party company to access your email.
Simple user interface, more agile and easily customizable.
Great alternative, especially for casual users. Simple, streamlined user interface, feels fresh.
IMAP only. No support for local folders.
Easy to configure. Thunderbird no longer connects to hotmail and yahoo. No address book.
clear, easy to use, high flexibility
Professional looking interface, options available at the swipe of a fingertip. Very slick application.
K-9 Mail
SeaMonkey
Microsoft Office Outlook
eM Client
Evolution
Apple Mail
Mailbird
Spark
Claws Mail
Postbox
Opera Mail
Mailspring
Geary
Mutt
BlueMail
Airmail
Sylpheed
Microsoft Mail and Calendar
TypeApp
Polymail
K-9 Mail works on Android, can use POP3 or IMAP and is easy to use. It is open source with no ads.