nanog mailing list archives
Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)?
From: "John Levine" <johnl () iecc com>
Date: 26 Feb 2021 17:37:30 -0500
In article <CAKaVjbP2KyB5FGtzAqYjnaagg4P7+E+32d+2HFZnLTVUz7kphw () mail gmail com> you write:
1. Is there anyone actively using this Null MX? If so, may I please see that actual record line (in BIND zone file format) just to satisfy myself that I wrote mine correctly?
Yes. services.net. 3600 IN MX 0 .
2. Which one makes more sense from the practical point-of-view: having a Null MX Record for the no-mail domain, or having no MX record at all?
Null MX of course. See section 4 of RFC 7505. Large mail systems like gmail and recent versions of mail servers like Postfix all recognize a null MX. I suppose there are some dusty old mail systems that do something odd with it and throw an error message but so what? You don't want them to send you mail in the first place. R's, John
Current thread:
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)?, (continued)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? borg (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? Suresh Ramasubramanian (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? borg (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? Grant Taylor via NANOG (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? borg (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? John Peach (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? John Levine (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? Grant Taylor via NANOG (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? Alan Hodgson (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? Suresh Ramasubramanian (Feb 26)
- Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)? borg (Feb 26)