通过Gmail交换电子邮件而不泄露真实的电子邮件地址

I have a php forum which has 50 users and i am wondering how i can exchange emails between members without revealing their real gmail email addresses.The forum works this way.A user 'A' opens a contact form and writes and email and sends it to user 'B'.The email sent is received by user 'B' but does not reveal the real email address of user 'A'.When user 'B' replies,user 'B's' email is not attached anywhere in the email.

Are their existing solutions for this kind of thing.

Have a look at the PHP mail() function.

$to = 'send_to@gmail.com';
$subject = 'Some message subject';
$message = 'Oi, what\'s up?';
$headers = "From: Bob < some_other_email@gmail.com>
";

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