hMailServer is an Open Source email server that can be used by any user type, from internet service providers and governments, all the way to regular users.

Most users will be comfortable using it as it supports the most common email protocols (IMAP, SMTP, and POP3), and you have the option to integrate it with many existing web mail systems easily. There is also a score-based spam protection feature that can additionally be attached to your virus scanner, allowing you to scan all your incoming and outgoing emails. The interface is a little dated, but don't let that fool you, as it provides many valuable tools and features. One is the anti-virus tool that can delete entire emails if malware is detected. It will also notify the sender and recipient. hMailServer also includes the ability to block specific attachments that contain certain extensions like BAT, CMD, COM, EXE, and MSP.

hMailServer comes with a COM library that can be utilized to integrate your other software. With the COM library, you can write scripts and entire applications that utilize the included hMailServer features.