Hi Gert,

This is no reason whatsoever to limit the sending side to "we will always
only do v4, even if the reciever signals willingness to do v6".

you are absolutely right.
What i meant was, that it is accepable (in terms of *okay*) to use a IPv4-only service as long as 99,x percent of all email receivers worldwide do not want to accept emails via IPv6. You could still consider yourself as early adopter, if you start to send emails via IPv6 if ~5% of all recipients accept inbound emails via IPv6.

But I also recognize, that RIPE has some sort of pioneering role to play when it comes to new standards.
Using the term "new standard" in a context of IPv6 is shameful. Let's say "best practice" instead.

BR,
Simon

On 18.04.25 15:00, Gert Doering wrote:

hi,

On Fri, Apr 18, 2025 at 02:51:41PM +0200, Simon Brandt via ripe-atlas wrote:

currently, it is acceptable to use IPv4-only services for sending e-mails.

Whether or not you feel comfortable *receiving* mail over IPv6 is, of course,
your choice.  This is communicated by having appropriate DNS records.

This is no reason whatsoever to limit the sending side to "we will always
only do v4, even if the reciever signals willingness to do v6".


At least *our* Anti-Spam appliance has learned to do IPv6 reputation over
10 years ago, and this just works.  We have no idea how they do it, and
we do not really want to know - we asked them "make it happen or we will
have to buy something else" and they did.

The time for presenting excuses why deploying IPv6 is hard / impossible /
needs more time is long gone.

Gert Doering
        -- NetMaster