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> 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

by ytch 6y ago

> 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.

jethro_tell 6y ago
It's not just connect based, you have to connect and send an email. Which would be spam. Most systems I've worked on score based on how much your server looks like it's doing its job and moving on. 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