I've seen Microsoft do that very thing many times over the years,
accepting an email but never delivering it. I have to admit, I have not
once witnessed this with Gmail. Given how much volume we do where
customers bring their own domains, I would find it strange to have not
run into it, if it is an actual issue that occurs.
Filtering to the spam folder of course happens with email that received
a 2xx, but I've not yet seen a blackhole. I would be interested in
hearing more about it if anyone has collected any data around it.
On 2022-04-13 19:28, Rob McEwen via mailop wrote:
On 4/13/2022 6:58 PM, Jarland Donnell via mailop wrote:
Out of the 140,244 emails delivered to Google by my customers today,
not a single one has complained of issues with Google rejecting
legitimate email.
Even so, keep in mind the following:
(1) Their most egregious false positives - ARE delivered - they return
a "250 OK" response - but then Google's spam filter does a 2nd round
of spam filtering - AFTER the SMTP connection has completed - and
that's where MOST of their most egregious false positives occur -
partly because the sender THINKS that their message was delivered.
(2) These are OFTEN the types of mistakes that are most often unknown
to the sender - since the sender then never gets back a non-delivery
notification. (and unfortunately not everyone is savvy and consistent
with requesting and monitoring for "read receipts" for important
hand-typed emails!) So then they don't "complain" to their mail hoster
about a problem they don't even know exists! (so their lack of
"complaints" is an inadequate/flawed measurement of success in this
case!)
For example, I have a close relative who was the CFO of a company a
couple of years ago (with hundreds of millions in annual sales) -
before he switched to another company - and what I'm about to describe
occurred AFTER Google's huge move to going "all in" on A.I. for email
processing - and so this company almost lost the renewal of a
multi-million dollar deal because their client's hand-typed messages
were getting 250 OK answers, but were spam-filtered after-the-fact by
Google. The client thought that they were getting dissed by their
vendor - since they didn't get non-delivered notifications for those
emails - and so this client was already in the process of looking for
a new vendor when someone at my relative's (former) company spotted
the false positives from this client in the spam folder at the last
"final hour" and just barely saved the deal.
Of course, that's anecdotal and ALL spam filters have occasional
egregious false positives. But it's just that your "delivered to
Google" might not mean as much as you thought that it meant! It's
possible that a few of those 140,244 emails might not have made it to
the inbox!
--
Rob McEwen, invaluement
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