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postfix with new MX record
https://forum.linode.com/viewtopic.php?f=11&t=3064		 Page 1 of 1
Author:  jcr [ Thu Jan 24, 2008 10:35 am ]
Post subject:  postfix with new MX record
Hello,
Currently, my email system with Postfix and Dovecot runs fine. The MX record links to my root A record (let's say domain.com) and I have added to the configuration file:
virtual_mailbox_domains = domain.com

I need to change the A record of that MX record to something like mail.domain.com so that email and regular webiste can point to a different server.

Addinc the A record mail.domain.co and changing the MX record is easy.
But, do I have to change something to my postfix configuration? My limited understanding of emails tells me that the dovecot installation is not concerned with that change.

Thanks
Regards
Author:  irgeek [ Thu Jan 24, 2008 10:45 am ]
Post subject: 
You won't need to change your configuration. The MX record is used by MTAs to locate servers which will accept mail for a domain. The DNS name for the MX doesn't even have to be on the same domain:

Code:
hostname ~ $ dig mx nurfherder.com

; <<>> DiG 9.4.1-P1 <<>> mx nurfherder.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41060
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

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

;; ANSWER SECTION:
nurfherder.com.         43200   IN      MX      5 mt-elbert.irgeek.com.

;; Query time: 456 msec
;; SERVER: 10.10.20.2#53(10.10.20.2)
;; WHEN: Thu Jan 24 16:43:45 2008
;; MSG SIZE  rcvd: 65
Author:  jcr [ Thu Jan 24, 2008 11:55 am ]
Post subject: 
I change my DNS records and I am done! Thanks a lot for your explanation. Very useful.
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