suse 11.2, postfix, mail conversion

All mail settings work when ppl send mails via outlook, gmail, …
but if mail is sent via php FORM it’s converted to plain text and no attachments are added…

any sugestions?

Where is the php form located - on your local server or from a web page on the Internet?
Is it your php form or someone else’s?
Does it work from a win pc?

I suspect it’s a problem with the form script.

all is located on my server.
When form is sending to mail@gmail.com it is formated in HTML but when is directed to mail@myserver.com it is plain-text formated.