I think your solution is perfect for problem. The biggest gripe I have with PHP is the mail interface. When you outgrow your currently solution, the next step I

I think your solution is perfect for problem. The biggest gripe I have with PHP is the mail interface. When you outgrow your currently solution, the next step I'd take is use your PHP solution to pass the mail request to a mail service provider. That will give you the most bang for your buck without added complexity. If you're feeling really brave and really want to roll your own solution, try to find a way to cheaply create a HTTP POST interface that you could point your form at to process your request. A python/django instance could do this but might be a lot of overhead for just a mail processor, for example. Just don't try to over engineer it. :)