problems with basic e-mail from forms

[larry_n_ok]

Being a rookie I've gotten by purely on luck and lots of tutorials. I have put together a very simple e-mail form that, until now, worked flawlessly. I have four computers in my office, three running Internet Explorer 6.0 and one Mac running Safari. I when sending the form, one of the PC's will not send the e-mail or give an error.

I asked a friend to try it from their computer and the same thing happened, one worked fine and the other didn't.
Are there any browser settings or headers I need to add/change to ensure this form will e-mail from most browsers?

any help is greatly appreciated.
thanks,
Larry

[NogDog]

Not really enough information to go on here. All I can suggest at this point is to run your form page through the W3C.org HTML Validator and make sure your mark-up is up to spec. If that doesn't point out any issues, then we'll probably need to see your form code and possibly the PHP code that handles it.

[Roger_Ramjet]

Look at the security and privacy settings on the individual copies of IE, if they are set for high security then IE can for instance not submit non-encrypted form data