Re: Really not prefer IPv6 MX

It might be nice to allow DNS names in esmtproutes along with a specification of whether to use the A or AAAA record. I am not qualified to lnow why this is a bad idea in the domain of mailhandling :)

> On Dec 3, 2024, at 6:24 PM, Ángel <[email protected]> wrote:
> 
> 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
> 
> 
> 
> 
> _______________________________________________
> courier-users mailing list
> [email protected]
> Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users


_______________________________________________
courier-users mailing list
[email protected]
Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users