On Thu, 14 Aug 2025, Peter N. M. Hansteen wrote:
On Thu, Aug 14, 2025 at 08:28:08AM +0100, Stuart Henderson via mailop wrote:
With some implemwntations it is possible to do this and accept mail from
conforming servers on the first delivery attempt (so not greylist-like
at all really in that sense), so you can do "early talker" (aka pregreet
delay) without the big problem greylisting has with retries from a
sending system that uses multiple exit IPs for retries of the same
email.
Yes, the multiple sender IP problem is the main downside of greylisting.
I've found that fuzzing the address to a /24 usually solves the IP address
problem without many false positivies. The more serious issue is that it
can be a long time until the sender retries which makes users unhappy when
they're waiting for a password reset or a 2FA code.
R's,
John
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