I have been very pleased with Mail You Like. It really is a very impressive application, with a great range of features. For a pretty unbeatable price you get a webmail system that is on many levels on-a-par with the likes of Hotmail and Yahoo mail. 

The system is so good, that I would definitely consider using it as my primary e-mail account, and so you can be confident that many of your users will do the same. The ability to set a tag line on all outgoing messages, means that you can effectively make all e-mails sent out by your users into adverts for your site... A really great marketing tool! 

On top of the range of excellent features and great price, the support you'll recieve is first-rate. Truly exceptional, friendly, fast, efficient and most of all  extremely helpful. No matter what your problem, he'll stick with you until its fixed and working! Thank you Sunhail. My only complaint, and its a very small one, is that the application is quite tricky to customize unless you really know exactly what you're doing. I have a reasonable grasp of ASP and have friends who do .Net, but when I tried to make changes, I just made a big mess of it. But Suhail did come to my rescue and will happily do customization work for you at a reasonable price.

If you're looking for a webmail facility for your site, then look no further!