[colug-432] Recent change in retry behavior from large e-mail sites, affecting greylisting?

Angelo McComis angelo at mccomis.com
Wed Jan 12 07:54:12 EST 2011

Speculation only here - - but perhaps a lot of the majors
(Yahoo/Google/MSN/AOL/etc) are doing "different" things in the wake of near
exhaustion of IPv4 numbering, using more resources in "the cloud," or with
resources being cramped, they simply don't bother to come back.  The
latter-most being non-RFC-compliant, as a 4xx error message is not to be
considered a perm fail, unlike a 5xx error.

Do the people who mail you ever share the error/bounce message back to you?
Does it have any clues?

I watch several lists where mail, spam, and trends like you mention would
light those other lists up like a Christmas Tree, yet there are no blow ups
on the other lists right now. Taking a current picture, the recent
discussions around anything close to this is an overall decreased in blocked
messages (indicating a smaller % of spam:legit email) because of a pretty
major spammer takedown a month or so ago.

Are you seeing any failures from unknown IPs later on? Has anything on your
side changed, such as your reverse DNS, MX records, etc?


On Wed, Jan 12, 2011 at 6:47 AM, William Yang <wyang at gcfn.net> wrote:

> Hey all-
> I've got only anecdotal evidence at this point, but I'm wondering if
> anyone else has noticed any changes in retry behavior at some of the major
> mail
> providers including Hotmail/MSN and Yahoo.  My greylist implementation
> is unchanged, but I've recently been getting out-of-band questions from
> friends and family about why they can't reach people at my mail servers.
> Logs show the initial greylisting reject (451 4.7.1 [error message]) and
> no retries.  The retry just never seems to come.  I've already got a
> substantial list of whitelisted senders because of known problems in how
> they retry, and I've checked to see if it required any updates both
> against the puremagic site and the milter-greylist distributions.  And,
> again, this is a change in behavior just over the past few weeks.
> Has anyone else observed this sort of behavior?
>        -Bill
> --
> William Yang
> wyang at gcfn.net
> _______________________________________________
> colug-432 mailing list
> colug-432 at colug.net
> http://lists.colug.net/mailman/listinfo/colug-432
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