Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Difference between sending through DNS or through ISP

Posted on 2008-06-20
4
Medium Priority
?
189 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
  • 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 1000 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

Veeam Disaster Recovery in Microsoft Azure

Veeam PN for Microsoft Azure is a FREE solution designed to simplify and automate the setup of a DR site in Microsoft Azure using lightweight software-defined networking. It reduces the complexity of VPN deployments and is designed for businesses of ALL sizes.

Question has a verified solution.

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

If something goes wrong with Exchange, your IT resources are in trouble.All Exchange server migration processes are not designed to be identical and though migrating email from on-premises Exchange mailbox to Cloud’s Office 365 is relatively simple…
There can be many situations demanding the conversion of Outlook OST files to PST format and as such, there is no shortage of automated tools to perform this conversion. However, what makes Stellar OST to PST converter stand above the rest? Let us e…
In this video we show how to create an Address List 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 Organization >> Ad…
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…
Suggested Courses

963 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