AtMail has just earned the highest rating — 5 stars –  in a ReviewBoard Magazine review by William Helgeson:

http://www.reviewboard.com/reviews/small_business/3913-AtMAIL-Mail-Server-Software-Review.html

Some quotes from the review:

We were amazed at the speed this server was able to accept mail. Our install was on the Linux platform and the install went off without a hitch. We were up and running in about 2 hours end to end. Our platform is even virtualized and the performance is far superior to what we had. The web interface is the fastest loading interface on the market.  I have 35,000 email (literally) in my inbox and it loads in less than 2 seconds. You actually do not need a client on your desktop.

There are almost too many features to list for this product, Groupware, Wireless, SMS, Web Mail.  […]  taken from the Atmail website, go there to see the full list and descriptions.

In closing I have to tell you our experience with AtMail email server has been phenomenal.  The support team is top notch and takes care of business the right way the first time. 5 out 5 stars for the AtMail team.  They are the best in the industry and that is why we use them.

In addition to reviewing AtMail, ReviewBoard has now replaced their aging Merak server with AtMail.

Full Review:   http://www.reviewboard.com/reviews/small_business/3913-AtMAIL-Mail-Server-Software-Review.html