[Mailman-Users] local recipient table

[Ruben Safir]

On 01/05/2018 01:41 PM, Dimitri Maziuk wrote:
> On 01/05/2018 11:49 AM, Ruben Safir wrote:
> 
>> SMTPHost seems to do a non-mx record lookup for the value ... which is a
>> little strange.
> When you look up a *host*, you look for A/PTR or CNAME. 

No, all dns look ups are for hosts.  Since this is SMTP, it would be
proper to assume it is an mx host

> When you look up
> an MX, you can look up an MX for a *domain*, *or* you could look up an
> MX for a *host*. 

NO NO NO

You are looking up a host.  You can do that with a domain name, or a
specific host name, but you are looking up for a HOST, or more than a
single host with rankings, with a specific ip addresses.

[ruben at flatbush ~]$ dig mx gmail.com

; <<>> DiG 9.11.2 <<>> mx gmail.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45910
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 6

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 55cb7894025bd1ae2219142e5a4fd300fac0b1a609978ecb (good)
;; QUESTION SECTION:
;gmail.com.                     IN      MX

;; ANSWER SECTION:
gmail.com.              3487    IN      MX      40
alt4.gmail-smtp-in.l.google.com.
gmail.com.              3487    IN      MX      30
alt3.gmail-smtp-in.l.google.com.
gmail.com.              3487    IN      MX      10
alt1.gmail-smtp-in.l.google.com.
gmail.com.              3487    IN      MX      20
alt2.gmail-smtp-in.l.google.com.
gmail.com.              3487    IN      MX      5
gmail-smtp-in.l.google.com.

;; AUTHORITY SECTION:
gmail.com.              161107  IN      NS      ns1.google.com.
gmail.com.              161107  IN      NS      ns3.google.com.
gmail.com.              161107  IN      NS      ns4.google.com.
gmail.com.              161107  IN      NS      ns2.google.com.

;; ADDITIONAL SECTION:
gmail-smtp-in.l.google.com. 296 IN      A       209.85.232.26
ns2.google.com.         161618  IN      A       216.239.34.10
ns1.google.com.         161618  IN      A       216.239.32.10
ns3.google.com.         161618  IN      A       216.239.36.10
ns4.google.com.         161618  IN      A       216.239.38.10

;; Query time: 1 msec
;; SERVER: 10.0.0.37#53(10.0.0.37)
;; WHEN: Fri Jan 05 14:33:20 EST 2018
;; MSG SIZE  rcvd: 341

[ruben at flatbush ~]$ dig gmail-smtp-in.l.google.com

; <<>> DiG 9.11.2 <<>> gmail-smtp-in.l.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3649
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: e107a7eb3dd41c69bad19c635a4fd3209ed6a84ada3378fd (good)
;; QUESTION SECTION:
;gmail-smtp-in.l.google.com.    IN      A

;; ANSWER SECTION:
gmail-smtp-in.l.google.com. 264 IN      A       209.85.232.26





>I expect in most cases if you query for MX for
> SMTP*Host* you'll get nothing -- I wonder how many admins define MXers
> for each host these days.
> 
> It shouldn't need FQDN though, it should add search domain suffix(es)
> from /etc/resolv.conf.
> 
> -- 


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