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• 08-28-2008, 4:15 PM

  T. R. Tinker Joined on 06-10-2005, 12:32 PM Posts 1

  Need IIS 5.1 SMTP Virtual Server help: SPAMHAUS.ORG blocking email Reply Contact I run a .Net 2.0 application in test/development from this workstation (XP Pro 3.0 w/IIS 5.1).  The application uses the default STMP server to send email from a web form. Recently, the person who should receive the test email (for approval) went behind the SPAMHAUS.org Zen product, and the test messages are now being blocked. I am on a dynamic IP address, and am not relaying the messages through an ISP email account.  According to SPAMHAUS, all dynamic IP addresses should be on their PBL-blocked list. I cannot find information about how to authenticate to the default SMTP server in IIS. Any help would be appreciated.  I would HUGELY prefer not to have to hard-code authentication credentials into the program. Has anyone had to get around the SPAMHAUS PBL list? (Who are these people!) Tinker A leads to B which causes C -- but it's usually not that obvious.

• 08-28-2008, 4:44 PM

  In reply to

  Marco_62 Joined on 08-27-2008, 11:34 AM Posts 2	Re: Need IIS 5.1 SMTP Virtual Server help: SPAMHAUS.ORG blocking email Reply Contact Try using a Smart Host to send messages to remote domains. In the Smart Host box, type in the NETBIOS name, fully qualified domain name, or IP address of the computer that should receive all mail destined for remote domains. It works for me. Hope this helps Marco

• 08-28-2008, 4:49 PM

  In reply to

  jeff@zina.com Joined on 09-26-2003, 10:43 AM Naples, FL, USA Posts 2,090

  Re: Need IIS 5.1 SMTP Virtual Server help: SPAMHAUS.ORG blocking email Reply Contact Unfortunately, SMTP authentication gets transmitted in the clear unless you use a SSL enabled mail server.  Worse though, for you anyway, is that Spamhaus lists dynamic IP's and won't budge on removing them.  Even if you get a static IP in a dynamic range it gets problematic. You really only have two choices.  The first is a static IP.  Spamhaus rightfully blocks dynamic IPs because if you are safe today, whomever gets your IP the next go around may not be.  The second is to send mail through your ISP or other mail server.  And then you get to expose the account in clear text if someone is sniffing the wire.  It's not an easy choice, but mercifully, stealing SMTP credentials is still really rare (it's not a direct grab, it takes someone who knows what they're looking at). Jeff Look for Wrox's new book Professional IIS 7 in your local bookstore, or order now at Amazon.com

• 08-28-2008, 6:40 PM

  In reply to

  tomkmvp Joined on 03-20-2003, 6:27 AM Central NJ Posts 6,160	Re: Need IIS 5.1 SMTP Virtual Server help: SPAMHAUS.ORG blocking email Reply Contact You may also want to look into using gmail to host your email - they'll do it for free. Tom Kaminski IIS MVP http://mvp.support.microsoft.com/ http://blogs.iis.net/tomkmvp/ http://www.linkedin.com/pub/8/690/408 http://www.bluesrepublic.org/

• 09-04-2008, 6:34 AM

  In reply to

  WenJun Zhang - MSFT Joined on 08-27-2008, 2:53 AM Posts 138

  Re: Need IIS 5.1 SMTP Virtual Server help: SPAMHAUS.ORG blocking email Reply Contact If you have a qualified SMTP server in Internet can help send the email, configure your SMTP virtual server to use that SMTP server as smarthost and relay all the emails to it. It's quite expected that personal SMTP with dynamic IP will be blocked. Thanks. WenJun Zhang - MSFT Sincerely Microsoft Online Community Support “Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”