Re: 2. Greylisting

[Steffen Schönbein <steffen%sdaoden.eu@localhost>]

Greg A. Woods wrote in
 <m1syaND-0036s2C@more.local>:
 ...
 |I would recommend turning off greylisting, as an experiment, to see what
 |happens.  I've found it to be entirely counter-productive.  It hasn't
 |been useful for literally years now -- the spammers have long ago adapted.

No.  I can assure you that it makes quite some sense here in my
little corner of the internet.
Whereas it has to be said that lots of bots get through
nonetheless, and most of the spam i truly get comes via Google.
(I do however use 

  # MAIL FROM Checks
  smtpd_sender_restrictions =
  ...
  check_policy_service unix:private/postgray,
  reject_unverified_sender,
  permit

so that after a bot passed by gray listing it will have to stand
sender address verification, and this is where most of them (and
not only bots) fail.
But nonetheless, address verification actively performs network
traffic from my side, and they should jump once before i do that.
(But i would prefer not to have written s-postgray but instead
have extended that postfix sender verification code to do a single
temporary reject.)

--Steffen Schönbein