> Send an email to every customer (domain, so pick a single customer at every domain)
Greylist is allow/block based on sender IP, not receiving metadata, so I guess pre-send mail from the IP might help, but yes, other rules might slow down.
Greylist is allow/block based on sender IP, not receiving metadata, so I guess pre-send mail from the IP might help, but yes, other rules might slow down.
Long connection with inactivity get tagged, scored and disconnected.
Connecting without sending an email leaves you in the grey list queue.
There is to my knowledge not a great way to pre-warm for grey-listing