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You can define a list of email addresses, blacklists, from which emails should always be rejected. On the other hand, you can also define a list of email addresses from which emails should always be accepted.
These rules are applied at the server level while the message is processed by the Queue Processing service. These filters are applied based on the "From" message header.
The "Greylisting" feature enables the Axigen server to automatically reject messages from unknown senders / IPs with a temporary error message ("451 Temporary rejected by greylisting"). Unlike legitimate email servers, most spam sources will not try to resend the emails in question, thus reducing the amount of spam received by Axigen.