Re: Really not prefer IPv6 MX

On 2024-12-03 at 19:12 +0100, Alessandro Vesely wrote:
> Too much work.  For the time being, this only happens with
> unimportant messages sent to comcast, so I just ignore it.

A simpler solution would be to configure on esmtproutes comcast.net to
deliver to the IPv4 addresses of their MX.

with the obvious caveat that it will break when they change their MX or
the ip addresses assigned to them.

I see their MX actually return different IP address each time, though.
☹ You would need to resolve it a few times to extract all of them.


Alternatively, a firewall block of [2001:558:fd00::/44]:25 would force
smtp IPv6 connections to Comcast to fail, ensuring courier will have to
fall back to IPv4.

Regards




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