contact us won't work

[mex]

Hi,

I can't enable the contact is page. I get an error when the submitting data

Email Error: Could not instantiate mail function.

Now I have my email set in contactus
define('SEND_TO_TEXT','<myemail....>

q)Where do i set this as my email is also set in the configuration->email.

q) My sitemap has a whole lot of pages i don't want listed and some not listed I created i do want.
Can i edit this in admin or do i need to make my own?

[mex]

I checked on google and couldn't find anything on these questions.
I think it might be easier to just create your own contact us and add a table to mysql for the result. The same for site map.