Setup a sub-domain in DNS

VeeDubbs

Limp Gawd
Joined
Dec 9, 2005
Messages
398
Hi all -

Not sure if my title correctly says what I'm trying to do, so, let me explain.

Let's say our domain is example.com. Our e-mail addresses use example.com (i.e., [email protected]) and we run our own DNS (running BIND 8.1.2, yes, I know it's old!) server on-site for example.com. We are covered by Postini for spam, viruses, etc... So, the MX records for example.com in our DNS server point to Postini (see below):

Code:
example.com	IN	MX	1	example.com.s9a1.psmtp.com
example.com	IN	MX	2	example.com.s9a2.psmtp.com
example.com	IN	MX	3	example.com.s9b1.psmtp.com
example.com	IN	MX	4	example.com.s9b2.psmtp.com

We have recently started using a new Help Desk software for tracking requests, problems, etc... It is web-based (URL is help.example.com) and allows for tickets to be submitted via e-mail. It uses postfix for the mail agent and just uses aliases for the e-mail addresses. Examples of e-mail addresses for this system are: [email protected], [email protected] and [email protected].

Since these e-mail addresses have come on-line, our tracking software is now getting spam in it, in the form of tickets! I'm assuming this is because these e-mail addresses are @help.example.com and not example.com; so, not covered by Postini.

So...I've gone to Postini and have setup a sub-domain of help.example.com. Setting up the sub-domain in DNS is where I've gotten stuck. I've copied the four MX records above (gave them 5, 6, 7 and 8 for their priority) and tacked help. to the beginning. Doing an MX test from Postini shows that example.com now has 8 MX records and help.example.com has 0 MX records.

So...what am I doing wrong? How do I truly setup a subdomain on a DNS server? Help!

Thanks!
 
I use ZoneEdit so it's a bit dumbed down, but that's how I have my subdomain's MX record set up.

Code:
invisibill.net.    MX    IN    0    mail.invisibill.net.
subdomain.invisibill.net.    MX	IN	0    mail.invisibill.net.
 
From what I gather... even if you have subdomains it goes to the same box right? So [email protected] goes to the same box as [email protected] - at least thats what i'd gather... but your spam software doesnt look for [email protected]e just computer@example

sooo im thinking maybe try this also?

Code:
help.example.com	IN	MX	1	help.example.com.s9a1.psmtp.com
help.example.com	IN	MX	2	help.example.com.s9a2.psmtp.com
help.example.com	IN	MX	3	help.example.com.s9b1.psmtp.com
help.example.com	IN	MX	4	help.example.com.s9b2.psmtp.com


?? im not sure really
 
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