On 9/12/22 23:34, Hans-Martin Mosner via mailop wrote:
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.
Thus encouraging the "Too big to block" mentality. Outbound spam
mitigation is a cost center. If the big providers have no incentive to
filter outbound spam, they won't.
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.
If an IP is a significant source of spam, it deserves to be blacklisted.
End of story. An RBL operator giving known spammers a pass due to their
size isn't being honest or transparent, and this behavior serves to
drive people to the oligopoly.
--
Jay Hennigan - j...@west.net
Network Engineering - CCIE #7880
503 897-8550 - WB6RDV
_______________________________________________
mailop mailing list
mailop@mailop.org
https://list.mailop.org/listinfo/mailop
