Gmail now also requires IPv6 rDNS for inbound mail servers - that caught me out ... | Hacker News

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dingaling on April 24, 2014 | parent | context | favorite | on: Mail-in-a-box: easy to set up modern SMTP/SMTPS se...

Gmail now also requires IPv6 rDNS for inbound mail servers - that caught me out for a few days when it was implemented.

Not a problem with a good ISP but many retail ISPs don't have a process for maintaining rDNS to arbitrary blocks held by subscribers.

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