From "Bill Cole via mailop" <mailop@mailop.org>
I'd be shocked to find a meaningful number of sites or users behind systems
using spamrl.com to block email. They offer no details about how to use it and
no reason to believe that they are anything other than an extortion racket.
(1) It's a large email hosting company that hosts many millions of
mailboxes - I think they use a combination of paid DNSBLs plus their own
in-house DNSBLs, then combine those in their spamrl.com domain that's
used in SMTP rejection notifications - which then makes it less clear
exactly which DNSBL (or other situation!) caused the message to get
blocked.
(2) They use this to get feedback/signals from end users - to try to
respond to upticks in complaints that are indicators of FPs. This
spamrl.com domain isn't actually a regular DNSBL that anyone can
actually use - it's more like a way for end users to click the links in
rejection notices, and submit delist requests as desired, to help this
email hosting company to have sort of a feedback loop to help make sure
that FPs are kept to a minimum (recognizing that not all delist requests
are as worthy as others - and SOME collateral damage is often
justified).
(3) They don't charge for delistings or "welcome-listings" - so there's
no extortion involved.
Compare this to them having NOTHING but "your message was blocked" - as
MANY email hosters do, with no way to report or complain about alleged
FPs - or sending back a "250 OK" message to the sender and THEN blocking
a MASSIVE amount of those already-accepted-emails as spam - as Google
and Microsoft OFTEN do - and then by comparison - this is actually a
much more responsible email hosting practice - even if not perfect and
not AS transparent as some would prefer.
Rob McEwen, invaluement
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