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From: Bastian Blank (bastian+postfix-users=postfix.orgwaldi.eu.org)
Date: Thu Oct 28 2010 - 10:24:40 CDT
On Mon, Oct 25, 2010 at 02:20:51PM -0200, Leonardo Rodrigues wrote:
> nnn.domain.com.br (about 40 different subdomains) have only 2 (two)
> DNS entries:
> nnn IN MX 10 server.nnn.domain.com.br.
> nnn IN TXT "v=spf1 include:domain.com.br -all"
| ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 65089
| ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
| ;; QUESTION SECTION:
| ;nnn.domain.com.br. IN ANY
Nope, nnn.domain.com.br does not exist at all.
> i really dont know if this setup (MX record but no A record) is
> RFC-OK. The only think i know is that it's been working for years and i
> receive thousand of emails daily on my several subdomains with no
> problem at all.
It is. See RFC 821, 5321.
> question is .... do a domain (or in my case, a subdomain) *MUST*
> have an A record ? Is the config i'm doing (DNS speaking) correct or
> incorrect (RFC-speaking) ??
No. The name listed in the MX record may also only have AAAA for
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