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[Odhiambo Washington]

Okay, so Exim and Postfix act the same in their default configs unless one
changes it. Mark (Dale), does your Postfix act the same way? I think it
doesn't and maybe it's something you need to take a second look at??


On 23 December 2016 at 22:17, Richard Shetron <guest2 at sgeinc.com> wrote:

> 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 <guest2 at sgeinc.com
>> <mailto:guest2 at 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."
>>
>


-- 
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft."