On 2022-07-01 at 04:52:32 UTC-0400 (Fri, 1 Jul 2022 09:52:32 +0100)
Laura Atkins via mailop <la...@wordtothewise.com>
is rumored to have said:
On 30 Jun 2022, at 22:00, Michael Peddemors via mailop
<mailop@mailop.org> wrote:
I know this doesn't look professional, but the question from the team
member does this contravene any rules or best practices.
list-manage.com
This domain does not have any A records.
If there’s no website it doesn’t need an A record. Given how that
particular domain is used there isn’t a lot of reason to host a
website there.
Absolutely.
It has a single MX record pointed at:
mail.admin.mailchimp.com
That hostname exists, but it doesn't have an A RECORD.
Again, what’s the problem? Not every mailserver needs to have a
corresponding website.
No, but every name that is used as a RHS in a MX record MUST have an A
record so sending SMTP clients know where to connect. The defining RFC
for the MX record (974) makes that explicitly clear, even before the
days of formally defined 'MUST' et al.
It in turn has just a single MX Record.
inbound-mx1.mailchimpapp.net
Kind of a strange MX delegation.. I assume to avoid CNAME's
But it does seem very strange. Comments anyone? I didn't have an
answer for him..
What’s so strange about it?
It won't generally work. It is specifically called out as wrong in a
relevant RFC.
RFC974 sayeth:
Implementors should understand that the query and interpretation of
the query is only performed for REMOTE. It is not repeated for the
MX RRs listed for REMOTE. You cannot try to support more
extravagant
mail routing by building a chain of MXs. (E.g. UNIX.BBN.COM is an
MX
for RELAY.CS.NET and RELAY.CS.NET is an MX for all the hosts in .IL,
but this does not mean that UNIX.BBN.COM accepts any responsibility
for mail for .IL).
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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