I know that the webmail works with ASP but maybe in next versión of the software (2.0?) would be interesting add the posiblity of PHP. So we can choose.

First of all thanks for this great product!. My problem is that i have installed Php-Nuke and this portal sends e-mails to the people who wants to register but it only work with local addresses, not with others. I read somewhere that Mailenable doesn't work with PHP but i don't understand why works ...

yes it's a very good program. For me it is the first that i tried and everyday i see how lucky i was when i found this link. If the price of the enterprise versión is reasonable i'm considering to buy it.