Am Donnerstag, 27. November 2025, 06:32:15 UTC+00:00:01 schrieb ml+mailop--- via mailop: > I use greylisting for some RCPT addresses which have been "leaked"; > it still works fine: most of the time there is just one attempt > without any retry.
We still use Greylisting for some "suspicious" senders, but for only one attempt per sender/recipient combination to avoid problems with i.e. potentially affected email validation emails, the user need within < 10 min. (and less...). There are drawbacks, because there are senders today which may get blocked by greylisting, because they use on each attempt (all at once): - different sender hosts - different senders - broken message id handling making it difficult to track a email through greylisting processes. we see only very few of them, but unfortunately some of them are public entities (especially in swiss) which produce crappy web form email getting untypical high scores... If someone likes / has to share some of their practice for addressing this and similiar "newer" issues - thx for that! cheers, niels. -- --- Niels Dettenbach Syndicat IT & Internet https://www.syndicat.com PGP: https://syndicat.com/pub_key.asc --- _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
