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Unable to send mail to AOL client using SMTP server/IIS

Not sure which category to put this under, but I think this is the right one for my issue.

The issue is with my Windows 2003 server which is running an ASP.NET application on it.  I have a page that will e-mail a group of people (members of our golf club).  The e-mail uses the built-in SMTP server and IIS.

The e-mail are formatted in HTML.  The receiptent of the message is the member and the sender is based on the actual e-mail address of person sending it (basically - the senders e-mail may or may not match the domain hosted on the IIS server).

So what happens is that the mail messages all send fine, with the exception of the aol addresses (about 20 of the 160 e-mail accounts).  I get the following error:

****
Reporting-MTA: dns;U15185676
Received-From-MTA: dns;U15185676
Arrival-Date: Mon, 10 Apr 2006 14:11:20 -0500

Final-Recipient: rfc822;user@aol.com
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550 won't relay to user@aol.com
****

The server does not appear to be an open relay.  I have tested it against everything I could find on the net, and tested it via telnet from a remote workstation and it would not relay - so I'm thinking I have that all setup correctly.

I completely willing to post the domain, if necessary.

Thanks,

Richard
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dawho9
Asked:
dawho9
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2 Solutions
 
Jandakel2Commented:
I have had similar errors withing my network because of a SPAM filter or DNS Black list that is encountered along the way.  Som networks block emails with the aol.com suffix now because viruses and spam are so prevalent when associated with the xxx.aol.com domain.  You should see if there is any mention of either of these on your filter, if you have one.  Sometimes, also, networks will choose to drop all aol.com traffic, in order to block aol instant messenger, so that could be a problem on one end also....just a couple thoughts...

JK
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TheCleanerCommented:
You are probably using outbound port 25 of your own "mail server" which most ISPs block unless you are a certain business account.

Check with your ISP, you may have to change the outbound mail server name and/or IP and use the ISP's outgoing mail servers instead.  You'll still use your mail server for incoming.
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Jandakel2Commented:
If it was a firewall issue, no mail would be getting through, it would all be using the same port. He said it all went throught except for aol, so it's not a port thing.

JK
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dawho9Author Commented:
I spoke with my ISP of the server.  Its a dedicated server hosted by 1 & 1 and they said they have nothing blocking outbound traffic, except for the firewalls on the servers themselves.

There is no filter installed on the server for spam and 1 & 1 said there is nothing filtering e-mail beyond the server.

Thanks,

Richard
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SembeeCommented:
If it is a dedicated server, then make sure that it has a reverse DNS, and what the server announces itself as in the SMTP server is configured to match the reverse DNS. The forward DNS needs to resolve to the server as well.
AOL are very picky about who can deliver email to them. Take a look at their Postmaster site for more information: http://postmaster.info.aol.com/

Simon.
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Jandakel2Commented:
AOL has tried to cut down on thier SPAM and lots of people are having problems relaying to them.  Here is a link to a site at aol that addresses some of your issues:  http://postmaster.aol.com/trouble/

Check your Reverse DNS lookup using the tool found here too:  http://www.dnsstuff.com/  
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dawho9Author Commented:
Ok, so the problem seems to be with both AOL and Hotmail.  So I'm guessing it has to do with some sort of relay type issue.

Since I'm desperate for a solution, I'm changing the point value to 500 and posting DNS names (although you could have figured it out by the error message):

A: bmga.org
MX: mail.bmga.org

Running on an IIS/SMTP, Windows 2003 Server.

At far as I can tell, the reverse DNS is working as it resolves to what my ISP has of:

reverse: u15185676.onlinehome-server.com is what the reverse resolves to.

Thanks for any more help.

Richard
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SembeeCommented:
DNS Report doesn't throw back anything much of interest.
http://www.dnsreport.com/tools/dnsreport.ch?domain=bmga.org

Have you tried an SMTP Connector to route email through your ISP?
http://www.amset.info/exchange/smtp-connector.asp

Simon.

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TheCleanerCommented:
You can also try applying to AOL's whitelist:  http://postmaster.info.aol.com/whitelist/

Or get on the Goodmail accrediting list:  https://mailcenter.goodmailsystems.com/Certification/SelectCustomerType.jsp

SPF records may help as well, but I'm unaware if AOL or Hotmail is blocking non-SPF compliant servers yet.

Also, on your DNS Report like Sembee mentioned (http://www.dnsreport.com/tools/dnsreport.ch?domain=bmga.org) your DNS servers are incorrectly configured as "open", this is bad, even if it is unrelated to email.
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