It appears that Andrew C Aitchison via mailop <[email protected]> said: >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.
In the confusing standards lingo of the IETF, most actual standards are nominally proposed. The hassle of promoting proposed to full is high enough and the practical benefits low enough that we rarely bother. Null MX was proposed more than a decade ago at Yahoo and I finally resuscitated the draft and got it published in 2015. If your domain doesn't accept mail, publishing a null MX is a good idea. R's, John _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
