Our systems have had 'Fast Talker' support for some time now.. We also
don't support PIPELINING, so we can do fast talker at multiple stages.
While effective, the number of new attempts is relatively low.. I think
the hackers have caught on.
Of course the ones that still trigger, they usually get on the RBL's
real fast ;) so you don't see them a second time.
On 2025-08-14 00:28, Stuart Henderson via mailop wrote:
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.
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