Solved

Is this a good idea: [ ] Perform reverse DNS lookup on incoming messages.

Posted on 2007-03-27
4
1,044 Views
Last Modified: 2009-01-22
I've never enabled this on Exchange 2003 before:

[ ] Perform reverse DNS lookup on incoming messages.

Is this a good thing to have enabled or is there a significant potential downside of enabling this check? Thanks.
0
Comment
Question by:WineGeek
4 Comments
 
LVL 38

Accepted Solution

by:
Hypercat (Deb) earned 300 total points
ID: 18802696
Not necessary or really at all significant IMHO.  Exchange does not reject a message if it fails the RDNS lookup, so it really doesn't do anything to protect your server.  On a busy server it would probably have a negative affect on workflow, too, although I've never actually run into this anywhere.
0
 
LVL 12

Assisted Solution

by:Donnie4572
Donnie4572 earned 100 total points
ID: 18803041
It will add to the header of the message that the message failed PTR lookup. You should turn this on at the firewall or mail filter that can actually reject the message that fails.
0
 
LVL 104

Assisted Solution

by:Sembee
Sembee earned 100 total points
ID: 18804101
The option in Exchange is a waste of time. It does naff all other than cause a delay in message delivery and write something to the headers. As indicated above, Exchange cannot reject the message based on the results of that option.

Simon.
0
 

Author Comment

by:WineGeek
ID: 18804143
excellent stuff - thanks gang. Does anyone know why this option is available (the logic behind it) if Exchange cannot reject messages that it flags as having failed this RDNS check?
0

Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Need to replace the passsive node in a 2013 DAG 2 30
exchange, script, email address 7 43
Outlook 2016 Email address in memory 6 27
Exchange Certificate 5 39
Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
Find out what you should include to make the best professional email signature for your organization.
In this video we show how to create a Contact in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Contact ta…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question