On 2025/08/13 22:16, Peter N. M. Hansteen via mailop wrote: > On Wed, Aug 13, 2025 at 03:41:26PM -0400, John Levine via mailop wrote: > > It appears that Anthony Howe via mailop <ach...@snert.com> said: > > >For myself I've been happy with greylisting for years, though a more > > >practical > > >grey list time I use is 15 minutes, because when it is a real RCPT long > > >delays > > >can be annoying. > > > > I've been greylisting forever, but I've recently switched to early talker, > > It > > delays the initial greeting to unknown senders, hangs up if they talk > > before I > > do, then add to a whitelist so I don't delay them again. Five seconds is > > plenty, > > if they talk early they do it immediately. > > This sounds similar to spamd(8)'s default behavior for never seen before > contacts, > which is to stutter (again the default of one byte per second) for ten > seconds, > then proceed to add a GREY entry.
Similar-ish. It waits before sending the initial banner. Since clients aren't allowed to talk before receiving this, they are violating SMTP, so it's not too unreasonable to reject the delivery attempt if they have done this. IME this does drop some legitimate mail from senders with bad software, but not very much. 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. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
