This feature essentially bounces all unknown message trying to connect to your server. However, emails from Trusted Senders and White listed IP’s will automatically bypass Greylisting and are delivered directly to the Spool.
The premise is that Spammers create scripts that bombard your server with emails. These messages are then bounced back to their sending email server. Since, most Spammers email is not coming from a valid email server, the messages are not retried and therefore this reduces the amount of SPAM that your customers receive.
Trouble logging in? Simply enter your email address OR username in order to reset your password.
For faster and more reliable delivery, add firstname.lastname@example.org to your trusted senders list in your email software.