And, it’s not abusive if appropriate SPF checks are done first: obviously, you
don’t do the callout if you get an SPF fail. A callout with an SPF pass isn’t
abusive: if the domain sent me an email, then it should be able to handle a
callout.
Let me just say that a lot of people at large ISPs disagree with you.
Considering that about 90% of mail is spam, and about 99% of spam has
forged return addresses, in practice all of your callbacks are annoying
people who had nothing to do with the spam. If you're not getting
complaints, it's because you're too small to be worth blocking.
Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail.
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