Auto Responder

I need a new auto responder for the market. I need this auto responder to be re written to work with php 5.2 and up. There are some glitches with this one auto responder we use I like it but it is out dated. If prossible I would like it to be re written so I can call it my own with no issues. This auto responder only sends out half of the broadcasts for example if you have a list of a thousand emails it will only email out 500 emails and stop. I ask that you install it and see for your self the glitches of this script. I need it fixed. Also the import does not work right either. You can grab a copy of the script here and take a look and test all of the bugs. I need a full functioning auto responder with all of the features of this one along with adding face book and twitter api in the future.