MailEnable provides robust IMAP, SMTP and POP3 services for Windows NT/2000/XP/2003 systems. Simple to install, with powerful administration software that means your mail server will be up and running quickly. The standard edition is FREE, contains no spyware or adware, for both personal and commercial usage, with no time or user restrictions (TONS OF FEATURES). I use MailEnable for the majority of my email servers and I am 100% satisfied with ease of use, performance, stability, security, and the list goes on.
To give you an idea of my experience with email servers (so you can better understand how good MailEnable) I have 3 email servers for either specific business requirements or unique technology needs. The first server I have is a Microsoft Windows 2008 Server running MS Exchange 2007, another one is a FreeBSD server running QMail, and the third one is MailEnable on a Microsoft Windows 2003 box. All three of these email servers are great but one is very expensive and at times very difficult and temperamental (Exchange). Qmail on FreeBSD runs like there is no tomorrow, never any issues and reliable as all hell but also can be a pain if you are someone who doesn’t know Unix very well.
MailEnable seriously meets every need and expectation I have for an email server. It is highly configurable, much like Exchange, but it doesn’t cost a dime. There are 2 paid versions of MailEnable in addition to the killer free one, both strapped with many more options and unique features but as advanced as my needs are with all aspects of my computer life, MailEnable does just fine.

Here are just a few things the FREE version of MailEnable has to offer (god I sound like a salesman - I assure you I won’t make a single penny off this post, I seriously like MailEnable a lot!!)
Mail Protocols - MailEnable Standard Edition provides robust, stable and fully functional POP and SMTP mail services supporting unlimited users and domains.
Administration - The Administration application allows configuration of mail services via an easy-to-use and familiar Microsoft Management Console application. Administrative features include mailbox quotas, redirections, auto-responders, import/export users, create groups and much more…
List server - Includes a fully functional list server allowing you to subscribe or unsubscribe members and provide information mail outs or discussion groups.
Security - Extensive security measures and authentication methods protect your mail server from unauthorized access. Features include SMTP Authentication, Integrated Windows Authentication, Relay control.
Control panel integration - MailEnable integrates with several different third party control panel software products.
Diagnostic Reporting - Standard Edition includes advanced diagnostics via a comprehensive Diagnostic Reporting Utility which assists in quick diagnosis of issues and speedy resolution. Features extensive logging in W3C file format to easily determine faults.
Anti-Spam - MailEnable Standard has several inbuilt features to help eliminate spam. anti-spam features include PTR record checking, DNS blacklisting, auto-banning of IP addresses and much more. MailEnable is a standards-compatible mail server it can be used with a large variety of third party anti-spam software.
Here’s some screenshots:





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