internal server error

I have an email page that uses phpmail.php.
The first page that I setup works perfectly.

So what I did was set a new html text in for a
different email message and changed a few names.

Now I have an internal server error.
How or what would cause this type of error?
I will post my code if asked but I am not sure it
will make a difference.

Can you advise?
Kevin

Problem resolved
I had mismatched quotes

Kevin