smtp

B4Failure is a Windows suite that provides centralized monitoring for all aspects of infrastructure. It includes IP, network, and server monitoring, making it the most comprehensive software available.

This software is a tool for SMTP and POP3 usage in various programming languages. It allows for multiple recipients and types of attachments, as well as HTML formatting and different character sets. It provides authentication and supports various encodings.

This software tool checks your SMTP server, confirms if you can send direct, and suggests optimal configurations for bulk email software. It is a web-based solution that doesn't require any installation.

This web server can manage multiple domains and is compatible with various programming languages such as PHP, Perl, and MySQL. It is a robust platform with many additional features.

LiteMail is user-friendly mail server software that offers SMTP authentication, mail forwarding, and a catch-all address for domains.

Toolfish is a software that offers a variety of useful utilities such as email notifications, website monitoring, macros and hotkeys, reminders, application control, and more. It also includes an atomic clock adjustment feature and a "smart mute" function.