I have created a new User on the AD and a new Exchange Mailbox for myself, sending outbound and internal e-mail works fine. I am using Exchange 2003 Service Pack 2 on a Windows 2003 SBS Standard Server. However any inbound EXTERNAL attempts to send my address an e-mail --> joe@directmediapower.com Fails. Any help at all would be appreciated. I've been searching the web for hours and reading different articles and threads about similiar issues with no results. Thank you - Testing inbound SMTP mail flow for domain joe@directmediapower.com. ExRCA failed to test inbound SMTP mail flow. Test Steps Attempting to retrieve DNS MX records for domain directmediapower.com. One or more MX records were successfully retrieved from DNS. Additional Details MX Records Host directmediapower.com.pri-mx.na0104.smtproutes.com, Preference 10 , Host mail.directmediapower.com, Preference 50 , Host directmediapower.com.bak-mx.na0104.smtpbak.com, Preference 20 Testing Mail Exchanger directmediapower.com.pri-mx.na0104.smtproutes.com. One or more SMTP tests failed for this Mail Exchanger. Test Steps Attempting to resolve the host name directmediapower.com.pri-mx.na0104.smtproutes.com in DNS. The host name resolved successfully. Additional Details IP addresses returned: 174.36.154.100, 208.43.37.100 Testing TCP port 25 on host directmediapower.com.pri-mx.na0104.smtproutes.com to ensure it's listening and open. The port was opened successfully. Additional Details Banner received: 220 tex1-mh335.smtproutes.com kath-5.0.3 ESMTP Ready Attempting to send a test e-mail message to joe@directmediapower.com using MX directmediapower.com.pri-mx.na0104.smtproutes.com. Delivery of the test message failed. Additional Details The server returned status code 550 - Mailbox unavailable. The server response was: 5.7.1 Recipient rejected (R4) Exception details: Message: Mailbox unavailable. The server response was: 5.7.1 Recipient rejected (R4) Type: System.Net.Mail.SmtpFailedRecipientException Stack trace: at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()

Hi , Please verify if the problematic account can send/receive email from internal. Please check the DNS configuration, the lower the number the higher the priority. And I noticed the priority of Host directmediapower.com.pri-mx.na0104.smtproutes.com is highest, so external user send the message to joe@directmediapower.com using MX directmediapower.com.pri-mx.na0104.smtproutes.com. Attempting to send a test e-mail message to joe@directmediapower.com using MX directmediapower.com.pri-mx.na0104.smtproutes.com. Delivery of the test message failed. Please change priority and test again. Wendy Liu TechNet Community Support

1. Yes, 100% I can send and receive internal e-mail here on our LAN. **All other users on the network can send and receive internally AND externally - don't forget, it's just my e-mail that is not receiving** 2. I do not understand how to change the priority of the DNS. I am very new to using Exchange and this is a new network to me, I have not set this up. However if I use external e-mail i.e. Yahoo! mail, then I receive an undeliverable message as follows: Reporting-MTA: dns; p3plwbeout13-05.prod.phx3.secureserver.net [173.201.192.170] Received-From-MTA: dns; localhost [10.6.247.4] Arrival-Date: Tue, 09 Oct 2012 10:20:41 -0700 Final-recipient: rfc822; joe@directmediapower.com Action: failed Status: 5.1.1 Diagnostic-Code: smtp; 550 5.7.1 Recipient rejected (R4) Last-attempt-Date: Tue, 09 Oct 2012 10:20:54 -0700 Joe

Joe , Would you tell me your infrastructure ? how many mail server in your environment ? why do you configure multiple MX records and set priority ? Change MX record priority(we need to change it on external DNS server): Open DNS Manager right click MX recordpropertiesMail server priority Wendy Liu TechNet Community Support

Wendy, Infrastructure is - one server, one domain, 2003 Server SBS w/ Exchange 2003. 1 mail server. Multiple MX records, I do not understand? External DNS server, my ISP ? my host ? Thank you for your help - please reply. -JoeJoe

Hi , If we only use Exchange from internal, we need to set this records on internal DNS server. But if we use Exchange from external, we need to set this records on External DNS server (that is DNS server in public network ). So please find the place these records are set. And change priority and test.Wendy Liu TechNet Community Support