Apps similar to Mail by elementary (formerly Pantheon) include Thunderbird, which is free and open source. Other options are Microsoft Outlook, Evolution, Mailspring and Apple Mail. You're spoiled for choice with Email Clients like Mail by elementary (formerly Pantheon): we list more than 50 alternatives for Windows, Linux, Mac, Android and the web.
Mac IMAP email client featuring keyboard control, Markdown email composition, advanced search capabilities, smart mailboxes, automatic signature handling, cryptographic options with OpenPGP/S-MIME, tagging, multiple notifications, and customizable layouts including widescreen.
Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 20 MB of RAM.
Spain
EU
Scribe is a small portable email client with an intergrated contact database and calendar. It supports all the major internet mail protocols and uses international standards where possible. Scribe doesn't required installing or uninstalled and can be used from a removable...
Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.
CzechiaEU
Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic contact- list management, custom code insertion via a hook system, and more.
Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.
The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
United States
A modern, lightweight and private email client for Windows and Linux. Unlimited IMAP accounts in one unified inbox, tracking pixels blocked by default.
ItalyEU
Eudora started in 1988, at the University of Illinois because the internet was a growing and burgeoning place, but email was not really established on the desktop computers that people were using at the time.
An enterprise application server that integrates information into a single workspace, integrates also a full mail server
India
Experimental terminal mail client aiming for configurability and extensibility with sane defaults.
