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When mail server got only ipv4 address and enabled 4to6 interface, gmail server block mail because of no ptr record of 4to6 address. Why...?

Isn't 4to6 address not global standard...?

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4to6 is a way to allow IPv4-only machines to access IPv6-only content. It's wholly inappropriate for a mail server to use.

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  • I mean why google don't consider 4to6 address is not public ipv6 address.
    – kj.park
    Feb 13, 2014 at 4:03

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