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Is it possible to solve by some kinds of warming up? AFAIK greylist is IP-based. We can send email at regular time so all the sender IP can keep in list. But e

• jethro_tell 6y ago
  How would that work? Send an email to every customer (domain, so pick a single customer at every domain) and send them an email with a fake login, or a note that says please disregard? Aside from that being spam, it's also likely to get legit emails stuck in spam filters as people start marking them as spam. Secondly, I think most of the largest providers don't really grey list any longer. They seem to have moved to inbound throttling. So your first email goes through but then if you send a rash of mail, you end up seeing the throttle on the back side.
  • 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