troubleshooting Question

Can send but cannot receive on Exchange Server 2007 SP3

Avatar of steviekz
steviekzFlag for Australia asked on
27 Comments1 Solution670 ViewsLast Modified:
Hi All,

I recently installed Exchange Server 2007 SP3 (64BIT) on my Windows Server 2008 R2 (64BIT) System.

After configuring the Exchange Server, I find I can Send emails without any problems, however, I cannot Receive.

Logged into my Mailbox (OWA) and sent an email to my Hotmail Account. Once received, I replied. Navigated back to OWA and cannot see any emails from "Hotmail". I have checked to see whether all of my "Port Forwarding" have been configured correctly;

•      PPTP TCP/UDP 1723 1723
•      L2TP TCP/UDP 1701 1701  
•      POP3 TCP/UDP 110 110
•      SMTP TCP/UDP 25 25  
•      Telnet TCP/UDP 23 23
•      FTP TCP/UDP 21 21  
•      HTTPS TCP/UDP 443 443
•      HTTP TCP/UDP 80 80
•      RD TCP 3389 3389
•      SSMTP TCP/UDP 587 587
•      SMTPSSL TCP/UDP 465 465
•      SMTP587 TCP 587 587  
•      LDAP TCP/UDP 389 389
•      UDP TCP 500 500  
•      SPOP TCP 995 995
•      TLS TCP/UDP 143 143
•      PPP TCP 146 146

I also ran a utility called "Email Address Verification ( and ended up with the following message:

Mail server found for domain
- (priority 10, ip address:
Error connecting to mailserver:
 No route to host

Another utility which I ran was the Microsoft Exchange Remote Connectivity Analyser and ended up with the following error:

      Testing inbound SMTP mail flow for domain
       ExRCA failed to test inbound SMTP mail flow.
      Test Steps
      Attempting to retrieve DNS MX records for domain
       One or more MX records were successfully retrieved from DNS.
      Additional Details
      Testing Mail Exchanger
       One or more SMTP tests failed for this Mail Exchanger.
      Test Steps
      Attempting to resolve the host name in DNS.
       The host name resolved successfully.
      Additional Details
      Testing TCP port 25 on host to ensure it's listening and open.
       The specified port is either blocked, not listening, or not producing the expected
        Tell me more about this issue and how to resolve it
      Additional Details
       A network error occurred while communicating with the remote host.

I understand that Port 25 is blocked and did run another utility called "Port Checker" (done online) and stated that my Port 25 on my WAN IP is blocked.

What would be the best course of action?

Thanks guys!!

Tony J
Lead Technical Architect

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