nanog mailing list archives
Re: Newbie Question: Is anyone actually using the Null MX (RFC 7505)?
From: Alan Hodgson <ahodgson () lists simkin ca>
Date: Fri, 26 Feb 2021 11:11:59 -0800
On Fri, 2021-02-26 at 12:03 -0700, Grant Taylor via NANOG wrote:
On 2/26/21 11:46 AM, borg () uu3 net wrote:Well, I bet my legacy system will bounce it for example...What specifically is the bounce? I thought the purpose of the Null MX was to do two things: 1) Provide as an MX that can't be connected to.2) Serve as a signal to things that know how to interpret it that no mail is to be expected. I would expect that some server, if not the MSA, /would/ generate a bounce /because/ the email to the domain is undeliverables.
Exactly. Postfix bounces it immediately with an accurate message: Domain ???.com does not accept mail (nullMX) This seems preferable to waiting hours or days for a bounce due to not being able to connect to the A record on port 25 or w/e.
Current thread:
- Newbie Question: Is anyone actually using the Null MX (RFC 7505)? Pirawat WATANAPONGSE via NANOG (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)? 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)