I have taken over a site that has Matt's formmail script on it. It has been running fine for over a year but in the last week when someone goes to sign up for a newsletter, the browser doesn't execute the script, it downloads it.

In Firefox it shows the script in the browser and in IE it offers a download dialog box.

Any ideas why this is?

I have re-uploaded the script, changed and checked the permissions. I find it strange that it has only just started happening and had been working fine up until now.

Any advice would be great, thanks