Hi Everyone, I found this little gem on my SMTP error logs:
reason: 521 A URL (schema.org) in the email resolved to a blacklisted IP: 521 The IP 216.58.208.46 is Blacklisted by dnsbl.sorbs.net. Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml?216.58.208.46 -- . type: blocked email: redac...@redacted.com a quick lookup in SORBS shows a DUHL listing. so, that does seem braindamaged for so many reasons: obviously, redacted.com seem to be doing the wrong thing about SORBS. DUHL doesn't seem intended to stop HTTP hosts. OTOH, the SORBS entry seems very odd: schema.org is hosted by google, not really a dynamic range (but with broken PTR record?) Name: schema.org Address: 216.58.208.46 46.208.58.216.in-addr.arpa name = lhr08s07-in-f46.1e100.net. 46.208.58.216.in-addr.arpa name = lhr08s07-in-f14.1e100.net. (ironically, we don't even link to schema.org, we use google's email markup - that probably many many senders use) if anyone from google or SORBS is reading this, a fix would be nice. we are not impacted to any real capacity, but I'd wager it can cause some unwarranted mail loss at times. other than that, I found this very interesting and share-worthy. if you are running another RBL or DNSBL, I think whitelisting schema.org and its IP is also a prudent thing. Regards, Gil Bahat, DevOps/Postmaster, Magisto Ltd.
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