Hi, I successfully installed exchange 2007. Currently I can send mails externally without any problem what so ever but the problem is I cannot receive mail from external/internet. Internal mails flows fine as well. Below is the error message from a external user trying to send mail to this exchange server. "Your message did not reach some or all of the intended recipients. Subject: RE: test Sent: 9/23/2010 11:38 AM The following recipient(s) cannot be reached: Ince Gebe on 9/23/2010 11:38 AM The destination server for this recipient could not be found in Domain Name Service (DNS). Please verify the email address and retry. If that fails, contact your administrator. <dalsbs01.dalsol.local #5.4.0>" Just an additional info....I did remove the default receive connector and added a new one to allow internet mail from anonymous user but still cannot receive mail from external. I did ran the Microsoft Exchange Remote Connectivity analyser online for incoming mails...MX Record and Port 25 is configure fine without any error. I thought something is not configured right on the exchange. Here is the error from the Connectivity Analyser " Attempting to send test email message to igadmin@hcc.com.sb using MX mailserver.hcc.com.sb. Delivery of the test message failed. Additional Details Server returned status code 550 - Mailbox unavailable. The server response was: 5.7.1 Unable to relay Exception details: Message: Mailbox unavailable. The server response was: 5.7.1 Unable to relay Type: System.Net.Mail.SmtpFailedRecipientException Stack trace: at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally() Appreciate if anyone can help Cheers

Dear you can use telnet for troubleshooting open cmd and type "telnet exchangeIP 25" and try to send a test email using the telnet session. If it is successfull then this is a DNS problem.You can then use the mxtoolbox.com to verify your mx record. thx

Hi, Please check following things --> 1) Are you able to send to mails to yahoo, hotmail accounts from same server where you are getting this error. If no then please check the DNS resolution on the sending server. 2) Please check that you have not updated any NS records recently of the domain where you are trying to send the mails. As NS changes require some time to propogate. Thanks.

On Thu, 23 Sep 2010 02:54:21 +0000, Souljah_e wrote: [ snip ] >I did ran the Microsoft Exchange Remote Connectivity analyser online for incoming mails...MX Record and Port 25 is configure fine without any error. I thought something is not configured right on the exchange. Here is the error from the Connectivity Analyser Here's a transcript of a simple SMTP conversation with your MX: 220 HCCSBS01.hcc.local Microsoft ESMTP MAIL Service ready at Thu, 23 Sep 2010 15:19:52 +1100 ehlo XXXX.XXX 250-HCCSBS01.hcc.local Hello [66.XXX.XXX.18] 250-SIZE 10485760 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH 250-8BITMIME 250-BINARYMIME 250 CHUNKING mail from:<rich@XXXX.XXX> 250 2.1.0 Sender OK rcpt to:<postmaster@hcc.com.sb> 550 5.7.1 Unable to relay Is the machine mailserver.hcc.com.sb (IP address 202.1.163.158) an Exchange server or just a Windows Server running SMTP and acting as a relay for your domain? Whatever the problem, the machine at that address isn't acceptig e-mail for your domain. If it's an Exchange 2007 server, add your domain to the "Accepted Domains". If it's just a Windows Server you'll have to add the domain to the SMTP configuration. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Rich, Thanks, im quite new to exchange 2007 so a bit lost here. Well here is the setup scenerio. It is a windows server 2008 running as a domain controller and hosting the exchange 2007 as well. So how do I add the domain to the SMTP configuration? Cheers for you help

http://technet.microsoft.com/en-us/library/bb124745.aspx You may be using the Windows SBS server as he name suggests. Configure the Accpeted Domain on HUB server with the domain name as Authorritative.

Thanks a lot guys have it sorted. Cheers

I am having this problem also, when running mxtoolbox.com for my domain, I get the following: Timeout occurred due to inactivity. Status Result Session Transcript: 6/12/2012 7:05:25 AM Connection attempt #1 - Timeout occurred due to inactivity. [16.22 sec]