We just brought up an SBS 2008 server with Exchange 2007. It sends out to all domains with no problem but it recives mail from some domains and not others. The mail is bounced back with out a spcific error If I try to telnet in the port is unavaiable I get the same error if I use a online smtp tool. I have contacted my ISP and they assure me that they are not blocking any traffic to my ip. Each part I have tested is passing and I am getting email in from some place but not other I am trying to find something through search for ideas from search engines but not good leads yet and I have check my DNS settings.Please help

OK, could you please give me one test email account on where i can test few email testing?... what error i will get it i drop you an email?Arun Kumar | MCSE - 2K3 + Messaging | ITIL-F V3

Hi Brian, 1. Would you please let me know whether any NDR messages are received when attempting to send message to your domain? 2. If yes, please let me know the most frequent NDR error received. 3. From your description, I notice that you have attempted to telnet to your Exchange Server but get port is unavailable error. At this time, I suggest you logon the Exchange Server and telnet to itself to check whether the issue still persists. Mike

Yes as suggest Mike,Do telnet to your exchange server Either use start->run->cmdtelnet localhost 25 ehlomail from: anyvalidlocalemailid@yourdomain.comrcpt to: anyvalidid@validdomain.comdatathis is test email.quitor try with telnet <FQDN of exchange server> 25ehlomail from: anyvalidlocalemailid@yourdomain.comrcpt to: anyvalidid@validdomain.comdatathis is test email.quitand update us with the data requested by Mike Shen for further suggestionsArun Kumar | MCSE - 2K3 + Messaging | ITIL-F V3

Any update on this yet Brian?Arun Kumar | MCSE - 2K3 + Messaging | ITIL-F V3