$headers .= 'From:  <donotreply@maysite.com>' . "\r\n";
$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= 'Return-Path:<donotreply@maysite.com>\r\n';

mail($to, $subject, $messageEmail, $headers);

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what i need to add to (recieved my email generated, php mail() fuction) in inbox, because it always landed to spam

This isn't going to be your PHP code causing the filtering to spam. If your domain doesn't already have one, you want to set up an SPF record which states the server which this script is on is allowed to send mail. I don't know if maysite.com is one you've used just as an example but that domain doesn't have an SPF record.

You'll also want to make sure the content of the mail isn't spam-like.

Captcha isn't going to stop the mail being marked as spam. That just reduces the chance that the form is going to be abused.

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