Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Cannot send e-mail to hotmail, yahoo, aol, etc...

Posted on 2004-09-09
8
Medium Priority
?
333 Views
Last Modified: 2012-06-27
We are running Exchange 2003 on Windows Server 2003

For whatever reason we have intermittant issues sending e-mail to these organizations.  The messages time out as non-deliverable.  The addresses are known good addresses.  I've check dns resolution through nslookup and can get to the mx records with no problem.  I can also telnet to the mx addresses on port 25 so I know the server addresses are good.

I've also ran our domain against serveral blacklist databases and we come up clean.  I've also verified that relaying is turned off.  

I have heard over the last few months that these organizations were going to implement an antispam system called SPF.

Question:  Are the service providers listed above using SPF or is there another issue at play?

Thanks in advance for the assist.
0
Comment
Question by:SamuraiCrow
[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
  • 4
  • 3
8 Comments
 
LVL 12

Accepted Solution

by:
BNettles73 earned 2000 total points
ID: 12022714

I know AOL is in the process of setting up SPF and it has caused numerous headaches. To determine if it is an SPF type issue, I'd need to see the NDR failure notification. The NDR's generated due to these issues are a little bit different than the standard notifications.

That being said, you may look into the following solution - I've seen quite a few SMTP issues to yahoo, aol etc, be resolved by configuring an SMTP connector for these ISP's.

http://www.amset.info/exchange/smtp-connector.asp

Additionally, you need to make sure you have a reverse PTR record for your MX record.

Can you post an NDR that you are receiving?


Here is a link for AOL's SPF site ... it contains some info about some of the NDR failures you might see http://postmaster.aol.com/spf/
Here is a link about SPF if you haven't seen it ... http://spf.pobox.com/howworks.html
0
 
LVL 9

Author Comment

by:SamuraiCrow
ID: 12022747
Here is one that I've received from Earthlink,  I'll post the others as soon as they are forwarded to me from the users:

-----Original Message-----
From: System Administrator
Sent: Thursday, September 09, 2004 9:04 AM
To: 'user@earthlink.net'
Subject: Undeliverable:RE: Howdy

Your message did not reach some or all of the intended recipients.

      Subject:      RE: Howdy
      Sent:      9/9/2004 9:03 AM

The following recipient(s) could not be reached:

      'user@earthlink.net' on 9/9/2004 9:04 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <servername.aknp.net #5.5.0 smtp;550-EarthLink does not recognize your computer (ip address) as connecting from an EarthLink connection.  If this is in error, please contact technical support.>

Thanks for the info.  I'll look into the links you provided and get back with you.
0
 
LVL 12

Expert Comment

by:BNettles73
ID: 12022827
Definitely check out this link http://www.amset.info/exchange/smtp-connector.asp ...
also - make sure you have the reverse PTR record setup for your MX record (this is a public dns record, not local, unless you host your own DNS)
you may also want to configure your virtual SMTP server to masquerade as whatever your MX record is, instead of replying as <servername.aknp.net> ... if your MX record is mail.aknp.net then you would configure that in the masquerade instead of using the FQDN .... does that make sense?
0
Office 365 Training for Admins - 7 Day Trial

Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies.  Only from Platform Scholar.

 
LVL 9

Author Comment

by:SamuraiCrow
ID: 12022844
Sounds like a plan.  I'll make the modifications later tonight after the backups.  I'm pouring over the Amset site right now, looks like lots of good info.
0
 
LVL 12

Expert Comment

by:BNettles73
ID: 12022938

You can thank Sembee for that link later ... I saw him post it a few weeks ago I believe ... I've submitted the solution to 6 or 7 people since and seems like it works fairly well ...

we had a simliar issue with earthlink and aol but we ended up switching our DNS infrastructure to point to Microsoft's caching servers instead of using root hints ... this has worked fairly decent but the easier route seems to be using the SMTP connector ...
0
 
LVL 104

Expert Comment

by:Sembee
ID: 12028849
You can thank me for more than just the link... I wrote the page.

You can make the modifications live - if it doesn't work then the messages just sit in the queue. Adjust and then force the queues to try again.

That error message you got from Earthlink is very odd. You didn't try to enter Earthlink's SMTP server instead of the one from your own ISP (unless your ISP IS Earthlink)?

Simon.
0
 
LVL 9

Author Comment

by:SamuraiCrow
ID: 12029315
Negative.  The message resulted from a reply to an email from Earthlink.  Earthlink is not our ISP.
0
 
LVL 9

Author Comment

by:SamuraiCrow
ID: 12126494
Thanks for the prompt information and assistance.  It turns out that there were some internal issues as well as the ones that you pointed me to.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

The core idea of this article is to make you acquainted with the best way in which you can export Exchange mailbox to PST format.
On September 18, Experts Exchange launched the first installment of the Help Bell, a new feature for Premium Members, Team Accounts, and Qualified Experts. The Help Bell will serve as an additional tool to help teams increase question visibility.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
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…

715 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