WallaceR
asked on
Reverse DNS Setup -- what name should I use in the reverse lookup record
I think this is a fairly quick and easy question...
I am sending email from user@publicdomain.com and my exchange server is ComputerName.PrivateDomain .com
Should my rDNS record reflect mail.publicdomain.com or ComputerName.PrivateDomain .com
I am doing this to fix sending email to AOL and Comcast. (the returned message mentions my private computer name and domain)
Thanks so much for any help,
WallaceR
I am sending email from user@publicdomain.com and my exchange server is ComputerName.PrivateDomain
Should my rDNS record reflect mail.publicdomain.com or ComputerName.PrivateDomain
I am doing this to fix sending email to AOL and Comcast. (the returned message mentions my private computer name and domain)
Thanks so much for any help,
WallaceR
You dont fix this in your AD DNS server if that's what you are asking.
You have to get your ISP who owns the IP address you are on for sending email to setup the rdns. A ip to name resolution should reslove the IP to whatever your mail server's external hostname is, example mail.domain.com
You have to get your ISP who owns the IP address you are on for sending email to setup the rdns. A ip to name resolution should reslove the IP to whatever your mail server's external hostname is, example mail.domain.com
ASKER
Let me clarify my question -- I am asking what I should tell my ISP the rDNS record should respond with -- whether it is mail.publicdomain.com or computername.internaldomai n.com (or .local if I had set it up right). The error I received from Comcast which is confusing me:
<(computer.localdomain.com ) #5.5.0 smtp;521-EHLO/HELO from sender xxx.168.229.90 does not map to (computer.localdomain.com) in DNS>
where the "(computer.localdomain.com )" is from my local AD structure (the local machine name etc...) and not my mail.
Do I need to setup my local exchange server to show the public domain to the world or will it always show the local server name?
<(computer.localdomain.com
where the "(computer.localdomain.com
Do I need to setup my local exchange server to show the public domain to the world or will it always show the local server name?
When NAT is being used
In cases where NAT (Network Address Translation) is being used you will need to provide you ISP with the IP address of your external NAT interface, and configure your NAT device with Static Mapping for TCP Port 25, and have all TCP Port 25 traffic forwarded to the internal IP address of your mail server.
Let's say you have the following LAN configuration:
Internet
|
|
|
|
|
192.90.1.1/29 (Real IP from ISP)
|
Internet Router + NAT
|
192.168.0.1 (Bogus IP)
|
|
|
|
|
Mail Server----------------Swit ching Hub
192.168.0.10 |
(Bogus IP) |
|
|
|
|
|
|
Rest of internal network
In the above example you need to give the NAT's IP address as your MX Record.
Domain name: publicdomain.com
Record FQDN
Record Type
Record Value
MX Pref
mail.publicdomain.com
A
192.90.1.1
publicdomain.com
MX
mail.publicdomain.com
10
Note: Make sure you properly configure the NAT device to forward all TCP Port 25 traffic to 192.168.0.10.
In cases where NAT (Network Address Translation) is being used you will need to provide you ISP with the IP address of your external NAT interface, and configure your NAT device with Static Mapping for TCP Port 25, and have all TCP Port 25 traffic forwarded to the internal IP address of your mail server.
Let's say you have the following LAN configuration:
Internet
|
|
|
|
|
192.90.1.1/29 (Real IP from ISP)
|
Internet Router + NAT
|
192.168.0.1 (Bogus IP)
|
|
|
|
|
Mail Server----------------Swit
192.168.0.10 |
(Bogus IP) |
|
|
|
|
|
|
Rest of internal network
In the above example you need to give the NAT's IP address as your MX Record.
Domain name: publicdomain.com
Record FQDN
Record Type
Record Value
MX Pref
mail.publicdomain.com
A
192.90.1.1
publicdomain.com
MX
mail.publicdomain.com
10
Note: Make sure you properly configure the NAT device to forward all TCP Port 25 traffic to 192.168.0.10.
SOLUTION
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ASKER CERTIFIED SOLUTION
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comcastic
Thank you :)
check this out to too:
https://www.experts-exchange.com/questions/21764044/Reverse-DNS-Question.html