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Re: [ietf-smtp] G.7.3 --- resolvable FQDNs

2020-08-10 11:44:07
On 2020-08-07 7:08 p.m., John Levine wrote:
In article <22051.1596843872@localhost> you write:
The explicit discussion was that in some non-Internet contexts, the domain
name is not from the DNS.

I don't understand what that has to do with writing specs that
interoperate on the Internet. If a host is sending mail on the
Internet, it looks names up in the DNS.

Most mail servers have a hack that lets you put in routes manually to
locally override the DNS results, but I've never heard anyone say the
details of that should be standardized. Certainly in the MTAs I've
used, the way you do so has varied all over the place.


Just a thought, is this maybe time to enshrine some of the MAAWG recommendations surrounding this?

If your email server egress IP has a PTR of:

There SHOULD be a URL that responds to, where information and contact information about the operator can be found..

Also, some operators still find a need for multiple PTR's for an IP, and some language around avoiding too many PTR records for the same IP, and that EACH PTR should have an associated A record and functioning URL.

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