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If you can't control your PTR on IPv6, in postfix I recommend using: "smtp_address_preference = ipv4", instead of fully disabling IPv6.

This way you can still receive email from IPv6 servers.

I run an smtp server from home with a static IPv4 address (for which the ISP lets me configure the PTR), but their IPv6 is "beta" and they don't yet support delegation, which is rather frustrating, but different topic.

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