I run two mail servers one postfix and the other exim4, both on Ubuntu.
Any email to a gmail server is rejected with a 550-5.7.1 error, basically requiring a ipv6 ptr record.
I have known about this problem for a while but used other workarounds. Recently we have seen more and more people hosting their email on gmail using this own domains. So I decided it was time to solve the problem permanently. Unfortunately our IP addresses are provided by our ISPs and they don't provide ipv6 ptr records.
I solved it with the postfix server by setting up a list of domains to be to ipv4 only. That works well and is easy to add more domains as I discover them
Is there a comparable method for exim4? Or some other way of overcoming the problem? I have Goggled around and the postfix answers came up pretty easily, I've found very little on exim4.
I did find this web page: https://github.com/Exim/exim/wiki/How-to-force-IPv4-connections-for-specific-domains-if-IPv6-is-enabledBut I'm not sure how to implement it. I can certainly add a Router and Transport to the appropriate directory, but where should the domain list go under conf.d?
-- Rob
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