On 2015-06-16 14:23, Matus UHLAR - fantomas wrote:
> On 16.06.15 09:50, [email protected] wrote:
>> Subject: [courier-users] Different esmtproutes for ipv6 and ipv4 domains?
> there are not ipv6 and ipv4 domains. There are only ipv6 and ipv4 hosts.
I meant domains that have either or both A and AAAA records.

>> Is it possible to have a different relay in (or none) for ipv6 capable hosts 
>> than ipv4 only hosts?
>>
>> Normally I would have
>>
>> : relay.com
>>
>> Some hosts, like gmail,  support ipv6 and I want to use no/another relay for 
>> them.
> you can check and set up esmtproutes for gmail and others manually, but I
> don't see reason why should someone produce code that will compare how many
> hosts in MX RRs have A and AAAA records and compare those...
One simple reason is that sending mail over IPv4 require an SMTP-relay 
(because port 25 is blocked, or similar), while IPv6 does not.

I thought that Courier would use AAAA records in favor of A records? I 
noticed that when sending to gmail Courier is not using AAAA any more. 
Perhaps I have another error in my config? Did perhaps this change in a 
recent Courier?

~A


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