Some places consider greylisting to be denying access to a server that
they feel is spamming or connecting too often for a period of time,
though technically, this would be generally implemented as tracking the
triplicate of sender's IP, Mail From and Rcpt To, and allowed back after
5 minutes. Anything beyond a 5 minute wait will not generate notably
better results.
My guess is that their "greylisting" is either broken, or this is not
real greylisting, but some sort of deferment system that your server
triggered with volume and/or content. You might want to check to see if
there was unusual traffic to this IP, and also watch out for
re-triggering volume controls with spooled messages since that can
result in growing traffic to them over time.
Matt
Chuck Schick wrote:
I am getting bouncebacks from cable.comcast.com with the the error message
421 GreyListing Deny.
This is after 20 attempts to deliver the message. Has anyone else seen this
type of problem? I thought greylisting was suppose to approve an IP if it
tried again in a certain amount of time.
Is there something in Imail that is causing this?
Chuck Schick
Warp 8, Inc.
(303)-421-5140
www.warp8.com
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