在不支持php的mail（）函数的服务器上重写mail（）？

I've just shifted to WebFaction and didn't realise its mail() function doesn't do anything. WebFaction disable it for shared servers. Doh! The problem is my receipts are dispatched via mail() as well as some extra stuff I included to autotically send the order to the supplier. I've just shifted to WebFaction and didn't real