I currently use this Email Server at my home-based business for over 10 years now. It has never given any issues or problems.
An easy to use Windows Mail Server.
Ability Mail Server is an advanced, secure and high performing mail server. With support for all standard mail protocols, including SMTP, POP3, IMAP4, LDAP and WebMail, the software can meet the needs of almost any business or home user. Ability Mail Server is fully scalable with support for unlimited users and domains, ODBC and clustering. The mail server also includes strong SPAM protection, on-server antivirus scanning, Content Filtering, IPv6 and much more.
•Easy to use mail server. SMTP, POP3, IMAP4 and LDAP - Receive mail, send mail and access your accounts using any standard mail protocol.
•WebMail - Fully customizable 'Hotmail-style' access to your accounts via any web browser.
•256-bit SSL - Secure access to your mail with 256-bit SSL encryption.
•IPv6 Support - Future proof technology that supports both IPv4 and IPv6.
•SPAM Protection - Prevent SPAM with RBL filters, self learning Bayesian filtering technology, grey listing, SPF checking and much more.
•Antivirus Protection - Protect users from viruses by integrating your mail server with almost any existing antivirus product.
•Strong Security - Lock down your mail server with IP Restrictions, SMTP Authentication, Tarpitting, Anti-hammering and more.
•Content Filtering - Set up rules to control your mail content, run applications, send new mail and much more.
•POP3 Retrievals - Automatically download mails from other mail servers into local accounts.
•Mailing Lists - Send bulk mails to multiple email addresses and accounts. Opt-in mailing lists allow users to automatically add and remove themselves.
•ODBC - Store and control vital user information using an ODBC database. Integrate your mail server with other applications and web scripts.
•Remote Admin - Remote access to your settings, user accounts and logs via any web browser.
•Domain Administrators - Allow users to administer their own domains through WebMail.