On 2023-02-28, Jaroslaw Rafa via mailop <mailop@mailop.org> wrote: > Dnia 28.02.2023 o godz. 11:10:05 Julian Bradfield via mailop pisze: .... >> Maybe worth pointing that people do greylisting, and with >> greylisting it's helpful to retry quite soon. Immediately isn't >> useful, but within five minutes is. (I personally have one-minute >> greylisting set.) > > I do greylisting, and that's how I found out about the immediate retries. I > run postgrey with default setting which is 5 minutes, and I often see in > logs multiple retries within those 5 minutes, with first ones being really > almost immediate (15-30 seconds). I have no other MXes, so I can't observe > retries to other MXes, but I often see retries FROM different IP address > than the original attempt, which count as new entries for greylisting, as > greylisting works on triplet (client IP address, sender, recipient).
That too. Which is why I greylist not on individual addresses, but on /24s (or on /48s for IPv6). Of course there are still senders with larger mail farms, and some with widely scattered mail farms, but there's only so much I can be bothered to do .. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
