Message does not meet IPv6 sending guidelines regarding PTR 550-5.7.1 records and authentication

I resolved this myself.

After digging into the issue (there is a post in Apple Support Communities by Paul Derby "Google blocks receipt of IPv6 email sent by OS X Server"), I found the hack to force postfix to use IPv4 not to work.

Instead, I ended up setting the Configure IPv6 to "Link-local only" in the Advanced Network configuration for Ethernet. (It had been set to "Automatically", perhaps as a default, when updating OS X - Server sometime ago.)

I can now send to gmail addresses from my client devices without issue. However, it appears that the Internet Reachability function does not work now and so I disabled it (a small price to pay).

toop68,

I'm willing to try putting in a DNS entry for IPv6 on my server but please provide me the details (example) of how that would be done. Also I imagine that my domain registry would need to have the same DNS entry. When I looked into doing that (GoDaddy) there didn't seem to be a way to do it.

Thanks,

goofy8669

toop68,

Thanks to you, I am happy to report that the gmail rejection problem is solved!

I re-enabled IPv6 on OS X Server, went to my domain register and edited my SPF MX text record successfully. As you said, there was nothing to do in the server DNS. To re-iterate for others benefit, it's important to wait a period of time when updating DNS records until they take effect before trying to test the new settings.

Your example was very helpful (syntax) for creating my own txt record. In fact, I have never seen any documentation that describes the SPF text record syntax in this way before. As a side comment, the quotes are unnecessary for the GoDaddy DNS text records; but may be required in other domain registers.

Many thanks!!

goofy8669

Update: I want to take it back...you do need the quotation makes for the text record in GoDaddy...they are necessary.