sexy contact form file upload not working

[alainz]

I have three sites with the same form and the same security features but the two sites that are not using the native domain for their MX mail system are refusing to upload file by returning a server error
While the site that has its MX hosted on the same server as the domain name can upload the file without problem.

where can I make configuration change inside the sexycontact component to resolve this problem....?

http://www.ayambrand.com.my/about-us/contact.html
still not allowing uploading of files
http://www.ayam.com/about-us/main-contact.html
This one works fine
http://www.ayam.fr/about-us/main-contact.html
Also not allowing uploading files

Three sites with the same security setup but with different results...?
https://www.dropbox.com/sh/lnmohxud0wsc ... 6WCda?dl=0

[alainz]

Still waiting for reply since Wednesday...?