The classic email sending library for PHP
SMTP email proxy and relay server
EasyMailer: Bulk Email/SMS Sender Using SMTP
Executes orders received by email
A simple and fast cross-platform solution to send mass emails.
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
The first Open-Source high-performance MTA for high-volume senders
qpsmtpd is a flexible smtpd daemon written in Perl
C library for sending e-mail (with attachments) from C/C++
secure, reliable, fast MTA
Web and API based SMTP testing
Python API for Sendmail Milters.
Full SMTP/Mail server Appliance in 5 minutes
Multi-protocol server written in Java
A program to send mail via SMTP from command line
GITST FREE EMAIL SENDER
Wrappers around msmtp for use as queueing MTA with extra features
An unofficial web console to administer Apache James 3 server
Simple web interface for Postfix domains, accounts, aliases