Lettre is described as 'Mailer library for Rust' and is an app in the office & productivity category. There are six alternatives to Lettre for a variety of platforms, including Linux, Mac, Windows, Web-based and BSD apps. The best Lettre alternative is Postfix, which is both free and Open Source. Other great apps like Lettre are Mailpit, MailHog, OpenSMTPD and Inbucket.
Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and secure. The software is also known by its former names VMailer and IBM Secure Mailer.
Postfix is the most popular Mac & Linux alternative to Lettre.
Postfix is the most popular Open Source & free alternative to Lettre.
Mailpit is the most popular Windows alternative to Lettre.
MailHog is an email testing tool inspired by MailCatcher, but easier to install.
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange e-mails with other systems speaking the SMTP protocol.
OpenSMTPD is the most popular Self-Hosted alternative to Lettre.
Inbucket is an email testing application; it will accept messages for any email address and make them available to view via a web interface.
A lightweight SMTP server written in Go, made for receiving large volumes of mail. To be used as a package in your Go project, or as a stand-alone daemon by running the "guerrillad" binary.
Go-Guerrilla is the most popular Web-based alternative to Lettre.
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