mail dns help

here it goes
i need to add someones subdomain (help.abc.com) to my mail server so that i can send
out mail on their behalf for a job that we are doing (only temporary)
now my question is what do i have to do about reverse pointers reverse dns etc. so that
my mail does not get dropped as spam
this other company wants to point a MX record to my mail server
can somone shed some light on this for me
dano992Asked:
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jar3817Commented:
"what do i have to do about reverse pointers reverse dns etc. so that my mail does not get dropped as spam"
Nothing. As long as the ip that your mail server sends mail from has valid reverse dns it doesnt matter what email subdomains you are sending from.

"this other company wants to point a MX record to my mail server"
As long as you set your mail server to accept mail for that domain you shouldn't need to change anything else.
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PCMI-JayCommented:
You will need to contact your ISP and have them do a reverse record pointing back to the IP of your mail server....

I had to do it for a client last week... Only way around it.
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dano992Author Commented:
are you saying that if i
add my mail server to accept mail from "help.abc.com"
have them point the MX ("help.abc.com")record to my mailserver
sent mail out as help.abc.com
and my reverse pointers say "mycompany.com'
that all will work withought me doing anything?
the pointers all say "mycompany.com " nothing about "help.abc.com"
are you sure?
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dano992Author Commented:
pcmi-jay
can u have 2 reverse records pointing back to the same IP
I ALLREADY HAVE "MAIL.MYCOMPANY.COM"
CAN I ADD "MAIL.HELP.ABC.COM" TO THE SAME IP?

also do i need just reverse pointer ?
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jar3817Commented:
Yes that will work fine. The reverse DNS of the sending server has nothing to do with the FROM domain on the email envelope.
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jar3817Commented:
You CAN have more than 1 PTR record but it is pointless. Nameservers will return them in random order and the first one received is used. To cut down on confusion just stick with 1 PTR per IP.
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