Disable IPv6 for outgoing smtp connections if rDNS is not properly configure or the /64 is on a block list #6884
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Contribution Guidelines
What does this PR include?
This PR includes functionality to disable outgoing smtp connections via IPv6, if
Short Description
This PR seeks to solve the problem described in #6877 where rDNS cannot be configured for the assigned IPv6 address. It also seeks to address delivery problems where outgoing IPv6 addresses are on block lists, and they can't be removed as the /64 is shared cross multiple customers. This allows IPv6 to be enabled but not being used for outgoing smtp connections.
Affected Containers
Did you run tests?
Yes, however I did build full containers to test end-2-end yet. - I'm publishing this PR therefore as a draft to see whether this approach overall meets expectations.
What did you tested?
Individual functions, no complete tests yet.
What were the final results? (Awaited, got)