I agree with the general sense that GMail is misbehaving at spam
management, both incoming and outgoing processing is flawed (in my opinion).
I will just talk from the gmail's customer side: a customer of mine
moved to gmail. They still have secondary domains hosted with us. A
couple of weeks ago they started to miss email sent from the gmail'ed
domain to their secondary domains.
After investigation, several IPs used by gmail to send the email were
blacklisted. I had a tough time explaining to the customer that it was
gmail's fault to still use this IPs to send their email. Gmail never
acknowledged the problem and didn't change the outgoing IP addresses.
The problem was only "solved" when the blacklisting expired. And this
was to a paying customer with 200 Gsuite accounts...
Best regards
El 13/9/22 a las 1:54, Brandon Long via mailop escribió:
On Mon, Sep 12, 2022 at 4:16 PM Paul Kincaid-Smith
<[email protected]> wrote:
We have a reasonably large sample of messages sent from Gmail,
Yahoo and Outlook and can assess how much was "spam foldered" by
each of those services. We are in the same ballpark as John
Levine, who estimated that "about 30% of the mail I get from Gmail
is spam."
EmailGrades collects metrics about senders and receivers,
primarily to measure inbox placement and recipient engagement for
commercial ESPs vs a cohort of their peers, but we also have
insights regarding messages sent by mailbox providers like Gmail,
Yahoo and Outlook. For the month of August 2022, millions of
messages received from Gmail, Yahoo and Outlook's
email infrastructure by hundreds of thousands of panel mailboxes
reveals the following spam foldering rates:
Received at Gmail | Received at Yahoo | Received
at Outlook
Sent from Gmail 16% 38% 49%
Sent from Outlook 47% 78% 47%
Sent from Yahoo 5% 3% 9%
The way to read this table is, "Of the messages received by our
Yahoo panel mailboxes, 38% of those sent by Gmail were routed to
Yahoo's spam folder" and "Of the messages received by our Outlook
panel mailboxes, 9% of those sent by Yahoo were routed to
Outlook's junk mail folder" and "Of the messages received by our
Gmail panel mailboxes, 47% of those sent by Outlook were routed to
Gmail's spam folder."
Does this indicate actual spam or just marked spam by the mailbox
provider? Does this indicate authenticated by
the sender provider, or less? This gets even more complicated when
you talk dkim replay.
Anyways, this also may indicate something else we know, which is that
spammers know that spamming another
gmail account is a great way for us to find them, so they tend to use
Gmail to spam non-Gmail.
These numbers are also worse than when I worked on Gmail years ago,
but it's always possible things
got worse.
All other things being equal, Outlook filters messages from Gmail
most aggressively. Yahoo filters messages from Outlook most
aggressively. Outlook filters messages from Yahoo most aggressively.
Outlook's spam percentages are higher than Gmail's but that may be
because Outlook chooses to block less outbound mail and instead
flags questionable outbound messages, sending them via a pool of
IPs that ought to receive additional filtering scrutiny.
I expect any reputation based anti-spam system should be able to tell
whether an MSP does this. Google definitely had separate sending
pools for various things in the past, and does expect that receivers
would eventually learn and
apply differential filtering based on that. No idea what the current
system does.
Brandon
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Eduardo Díaz Comellas
Ultreia Comunicaciones, S.L.
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