Solved

Difference between sending through DNS or through ISP

Posted on 2008-06-20
4
182 Views
Last Modified: 2010-03-06
When setting up Exchange 2003 one is asked whether ione wants to send through DNS or through an ISP's mailserver. It is recommended to choose DNS. I did so but soon found out that many mails were blocked because they were considered spam. Apparently an MX-record was missing. I changed back to ISP and it works now, but can someone please explain what the advantage is of DNS above ISP and what the MX record should contain?


Thanks
Theo Richel
0
Comment
Question by:TheoRichel
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 3

Expert Comment

by:Rikketyrik
ID: 21831961
You will want to setup a PTR/Reverse DNS record with your ISP. Give them a call and they will help set it up for you. They need to do the work. If your mail server is using mail.contoso.com then your PTR will be that as well mapped to the outbound IP for your SMTP. (Make sure it is outbound)

Many mail servers are blocking mail without the PTR record. It is pretty standard now a days.
0
 

Author Comment

by:TheoRichel
ID: 21832160
Thanks. But that is reasoning from the view that sending through DNS is better then through the mailserver of ones ISP. I still would like to know why.
0
 
LVL 3

Accepted Solution

by:
Rikketyrik earned 250 total points
ID: 21832350
Well you are net technically sending "through DNS" you are making a direct connection to the recipient mail server.

If I understand what you have going on. When you send mail you are relaying through your ISP and then on to the recipient. The recipient then replies back to your mail server. (I assume directly.) with no relay.

If you don't use the ISP, your mail sever directly contacts the recipient mail server. It is one less hop to make. Also, if there is some sort of problem with the ISP's mail server you will not be able to send mail. You are also subject to any relay restrictions they may have.
0
 

Author Comment

by:TheoRichel
ID: 21832476
OK that clarifies it, thanks
0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

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

Follow this checklist to learn more about the 15 things you should never include in an email signature from personal quotes, animated gifs and out-of-date marketing content.
A list of top three free exchange EDB viewers that helps the user to extract a mailbox from an unmounted .edb file and get a clear preview of all emails & other items with just a single click on mailboxes.
To show how to create a transport rule 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 Mail Flow >> Rules tab.:  To cr…
The basic steps you have just learned will be implemented in this video. The basic steps are shown to configure an Exchange DAG in a live working Exchange Server Environment and manage the same (Exchange Server 2010 Software is used in a Windows Ser…

734 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