Greylisting

Grey Listing Amazon Simple Email Service

Submitted by daniel on Fri, 03/05/2019 - 13:15

I have experienced issues either directly or indirectly with organisations that use Amazon's Simple Email Service.

After some investigation my plesk based mail server uses grey listing to cut down on spam emails. One consequence of this is if it does not recognise the mail server it will grey list it, essentially delaying the delivery of the said email. Eventually it will deliver it but chances are any token attached will have long expired.