Am 13.09.22 um 07:57 schrieb Eduardo Diaz Comellas via mailop:
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
That's an example why you should only blacklist a "grey" source if you have
very good reasons to do so.
* Either you don't reasonably expect legit mail from there, in which case your
blocking would only affect spam, which
is ok.
* Or you want to "teach" the senders to leave the spam-supporting provider. To
my knowledge, this rarely works, if
ever. You will be seen as the bad guy, and even if the sender decides to
change service providers they won't be
happy with you causing them significant costs and trouble.
Even though I'm squarely with the people who think Google does too little against outgoing spam, a blacklist provider
who lists their outgoing IPs should be avoided.
Cheers,
Hans-Martin
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