Cant send email through php..Again

[mmorning16]

Not really sure why i am puttting the ticket in but I dont have many options and these usually go unanswerd.

For some reason i can email from Outlook and the webmail. But i have a script I have been using for months that would auto reply to a form that was submitted and it is generating a error and not emailing it. There is a bit of code in the form that has some checks to see if the forms are sent.

           //now when the validation is done we check if the error variable is false (no errors)
            if(error == false){
                //disable the submit button to avoid spamming
                //and change the button text to Sending...Be Patient
                $('#send_message').attr({'disabled' : 'true', 'value' : 'Sending...Be Patient' });
                /* using the jquery's post(ajax) function and a lifesaver
                function serialize() which gets all the data from the form
                we submit it to send_email.php */
                $.post("send_email.php", $("#contact_form").serialize(),function(result){
                    //and after the ajax request ends we check the text returned
                    if(result == 'sent'){
                        //if the mail is sent remove the submit paragraph
                         $('#cf_submit_p').remove();
                        //and show the mail success div with fadeIn
                        $('#mail_success').fadeIn(500);
                    }else{
                        //show the mail failed div
                        $('#mail_fail').fadeIn(500);
                        //reenable the submit button by removing attribute disabled and change the text back to Send The Message
                        $('#send_message').removeAttr('disabled').attr('value', 'Send The Message');

Its is not working and not sending the forms out. Any clues?..