On Fri, 1 Jul 2022, Paul Smith via mailop wrote:
If you don't want to accept mail for a domain, usually, you'd accomplish that
by simply not having an MX record. Having an MX record which points nowhere
is odd, but not illegal - it just means that mail is undeliverable.
RFC7505 (still at "proposed") documented using pref=0,
zero-length label '.' and describes some performance benefits.
I see that example.com uses this.
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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