[Cialug] RFC & best practices for mail server hostnames?

[Gavin Campbell]

Seems like it's an issue on their mail server, not DNS.  That will be 500 cash please.

C:\Users\gavino>dig statefarm.com MX

; <<>> DiG 9.3.2 <<>> statefarm.com MX
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 196
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 3

;; QUESTION SECTION:
;statefarm.com.                 IN      MX

;; ANSWER SECTION:
statefarm.com.          1199    IN      MX      5 mail5.statefarm.com.
statefarm.com.          1199    IN      MX      5 mail3.statefarm.com.
statefarm.com.          1199    IN      MX      5 mail4.statefarm.com.

;; ADDITIONAL SECTION:
mail5.statefarm.com.    299     IN      A       205.242.229.171
mail3.statefarm.com.    1199    IN      A       205.166.218.186
mail4.statefarm.com.    1199    IN      A       12.34.246.167

;; Query time: 437 msec
;; SERVER: 192.168.12.252#53(192.168.12.252)
;; WHEN: Fri Feb 01 12:41:35 2013
;; MSG SIZE  rcvd: 145


C:\Users\gavino>dig -x 205.242.229.166

; <<>> DiG 9.3.2 <<>> -x 205.242.229.166
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 796
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;166.229.242.205.in-addr.arpa.  IN      PTR

;; ANSWER SECTION:
166.229.242.205.in-addr.arpa. 1200 IN   PTR     mail41.statefarm.com.

;; Query time: 94 msec
;; SERVER: 192.168.12.252#53(192.168.12.252)
;; WHEN: Fri Feb 01 12:42:31 2013
;; MSG SIZE  rcvd: 80


C:\Users\gavino>

-----Original Message-----
From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On Behalf Of L. V. Lammert
Sent: Friday, February 01, 2013 12:23 PM
To: Central Iowa Linux Users Group
Subject: Re: [Cialug] RFC & best practices for mail server hostnames?

On Fri, 1 Feb 2013, Nicolai wrote:

> >
> > Is RFC2821/3.6 the governing document?
>
> No.  The order to follow is:
>
> 821, obsoleted by
> 2821, obsoleted by
> 5321
>
Excellent - thanks!

> Are you talking about a subdomain with an MX record containing an IP 
> address, or a random machine, with no MX record, that lacks A/PTR records?
> Either way it's wrong.
>
No, I'm talking about the hostname passwd with EHLO - StateFarm is not sending a hostname, and our mail servers reject the email:

Feb  1 12:25:03 mx2 postfix/smtpd[21534]: NOQUEUE: reject: RCPT from
mail41.statefarm.com[205.242.229.166]: 450 <bp75avo2.opr.statefarm.org>:
Helo command rejected: Host not found;
from=<___________ at statefarm.com> to=<lvl at omnitec.net> proto=ESMTP helo=<bp75avo2.opr.statefarm.org>

Trying to isolate the Hostname requirement in the RFCs, and hopefully provide citations to try and get them to fix the problem.

	Lee
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