Two mail() routines--one works, one fails

[W9FZ]

I'm borrowing some PHP code to make a conference registration webpage. The code has a function that sends an email to me (the administrator) when there is a "problem". That one seems to be working fine and has mailed me many times.

function mail_admin($page, $error){
    $to = '[e-mail]';
    $subject = 'error on MUD Registration website, page '.$page;
    $message = 'The specific error message is '. $error."\n\n";
    $message.= 'Date: '.date('m-j-y')."\n\n";
    $headers = 'From: [e-mail]';
    mail($to, $subject, $message, $headers);
}

I have another routine that gets called with a somewhat long message-body passed to it. The actual mail() call is failing and the routine is always returning false. My questions follow the routine:

function send_success_email($email, $email_message){
    $to = $email;
    $subject = 'MUD Registration 2007';
    $message = 'Date: '.date('n-j-y')."\n";
    $message.= $email_message;
    $headers = 'From: [e-mail]';
    if(mail($to, $subject, $message, $headers)){
       return true;
    }else{
       return false;
    }
}

Will my mail program be sensitive to long lines? How about numbers of lines? Do I have to be fastidious about clipping line lengths to a certain length?

Yes, I'm working on commenting out lines of the complex message to see where the problem is.

Seeking your thoughts? Thanks in advance
W9FZ

[W9FZ]

ok, I've narrowed it down. Wouldn't you know it, my problem is probably outside of these routines. The problem seems to be a variable ($email) which has just passed validation seems to be empty when I'm calling the routine. So, my plot thickens while I try to determine why that and a bunch of other variables are showing blank.

Thanks
Bruce