Solved

undelivered emails to certain domains

Posted on 2008-09-30
7
318 Views
Last Modified: 2012-05-05
We have setup an SBS server 2003 that is acting as mail server (it is responsible for sending and receiving emails directly) with an static IP address. In 90% of the times the emails are reaching the recipients but there are some domains for which when an email is being sent from this server does not reach the recipient. However, we are able to send an email to the same recipient through gmail or another non sbs server. We have contacted the ISP who is hosting our recipient's email to check whether our IP is blacklisted on their server and the response was negative. Any idea why this is happening? is our IP address tagged incorrectly?
0
Comment
Question by:yourikh
[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
  • 3
  • 2
  • 2
7 Comments
 
LVL 9

Expert Comment

by:abdulzis
ID: 22609109
Do you have reverse DNS and SPF record setup correctly?
What does the queue status say?
Try to drop an email through telnet to that domain and see what happens.
0
 
LVL 4

Accepted Solution

by:
Dimarc67 earned 250 total points
ID: 22609169
I've come across this before on more than one occasion.  Forgive me if I explain anything you already know or have already addressed.

As an anti-spam precaution, many ISP's will block e-mails from any IP address that does not have a DNS PTR record (a reverse-lookup record) associated with it.  The result is exactly what you describe.

If you haven't already, you'll need to contact your ISP and request that a PTR record be created for your mail server's IP address.  It's also best to use the same name as your MX record for the PTR.  

For instance:
DNS A record:  mymailserver.mydomain.com..........120.121.123.124
DNS MX record:   [10] mymailserver.mydomain.com
DNS PTR record (on ISP's host):  120.121.123.124...........mymailserver.mydomain.com
(Actually, reverse lookup records are usually represented backward. So the above PTR is correctly displayed as "124.123.121.120.in-addr.arpa", but you'll rarely need to provide it that way.)

Hope this helps.

Dimarc67
New York, NY
0
 

Author Comment

by:yourikh
ID: 22609237
Thanks for the reply. I'll try to contact the ISP to see if the PTR can be created. I had a case where I asked the ISP (Bell Canada) to create the PTR and they said they do not provide that service. Is there any workarounds in case this other ISP (Rogers) tells me the same thing?
0
How our DevOps Teams Maximize Uptime

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us. Read the use case whitepaper.

 
LVL 9

Expert Comment

by:abdulzis
ID: 22609247
Any DNS/ISP should have the facility to create a reverse DNS/PTR record as it is a common thing.
0
 

Author Comment

by:yourikh
ID: 22609376
I'll keep you guys posted once I make the call to the ISP.
0
 
LVL 4

Expert Comment

by:Dimarc67
ID: 22609550
In fact, almost by definition, ONLY the ISP can create the PTR since the IP is presumably issued to them by ICANN.  There are some services that provide PTR ability outside the ISP, but it still must be supported by the ISP.

Unfortunately, it is possible that an ISP would refuse to create the record if your SLA does not allow connecting servers to the provided internet connection.
0
 

Author Comment

by:yourikh
ID: 22722399
Hi guys,

thaks for the help. It took Rogers 10 days to setup the DNS reverse lookup but now everything seems to be working fine.
0

Featured Post

MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

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.
Marketers need statistics and metrics like everybody else needs oxygen. In this article we explain how to enable marketing campaign statistics for Microsoft Exchange mail.
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…
In this video we show how to create a Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …

752 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