I have greylisting on my server, but sometimes I need to allow some external
users to send mail to my server without greylisting. I can't add them to
whitelist, because in most cases it's a new clients, so the good idea is to
ask them to add to mail's subject some code and to accept letters with this
code in subject without greylisting. But I can't understand how to implement
this simple idea in postfix. I need to move greylisting from SMTP headers
check to mail's body check and start greylisting only if Subject: mail
header doesn't match a regexp. How can I do it?
