Postfix is the same. I had to install a greylisting package to add
greylisting to postfix.
On 12/23/2016 9:50 AM, Odhiambo Washington wrote:
On 23 December 2016 at 17:36, Richard Shetron <gue...@sgeinc.com
<mailto:gue...@sgeinc.com>> wrote:
Maybe they were using some type of grey listing.
For those who don't know:
Grey listing is where the target MTA rejects with a retry error code
the email from a new source for some period of time. Every site can
set their own delay. Most spammers won't retry so it gets rid of a
lot of spam. Real email servers will accept the retry error (4xx)
and retry after some prefigured time from a few seconds to an hour
or more. The IP addresses are tracked and if retried after the time
limit are white listed for anywhere from a few hours to a month or more.
I know Exim will only treat a session as a failure if it gets 5xx. Does
Postfix do the same?
--
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft."
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