--- "Kurt A. Schumacher" <Kurt.Schumacher(a)schumi.ch> wrote:
Just a guess:
The more retries to a certain SMTP destination, the longer the retry
interval...leads to exponential delivery times.
no, it's quite sporadic: some emails are retried wihtin 10 minutes,
and some were delaying for hours.
Pure greylisting is - just like blacklistsing - is
useless or leads to
unexpected behavior without a well-maintained and monitored whitelist for a
corporate or ISP e-mail system.
it is actually a well-maintained whitelist, but of course sometimes