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A comment on Google moves to replace Flash with HTML5. Parent comment

Re:Google moves to replace Flash with HTML5 by cornedor on Friday May 20, 2016 @09:52AM (#11737762)
A college of my has struggled days with this issue, gmail wouldn't accept any mail send from a IPv6, ended up disabling IPv6 at the end. It seems like google only uses IPv6 for internal mail's, sending a mail to another account sends them using IPv4. Even Facebook, Microsoft etc still use IPv4 for their email's.
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Re:Google moves to replace Flash with HTML5 by dingaling on Friday May 20, 2016 @10:03AM (#11737824)
Google do of course use IPv6 externally, but require rDNS for all inbound IPv6 SMTP sessions. Without that set for your MTA's host they'll reject immediately.
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