Contact form stopped working

I’m using a PHP contact form that I found right here on Kirupa. It worked fine for a while and now, all of a sudden it doesn’t work anymore. I’m not getting any of the test emails I’ve been sending.

I did some looking around and found that maybe the “from” email needs to have the same domain as the site. I switched it so that it would and it’s still not working.

If anyone has seen this before or could help me in some way, that would be great. Just let me know what you need and I’ll post code, source files, links or whatever else you need. Thanks.