I am getting the following error messages. Can someone help me? Let me know what other information you need. We do have a SMTP connector configured on the server that points to a Sendmail server (Sun Solaris) but it looks like this is an internal problem. How can I change the port on the virtual SMTP server and which one should be changed? Type: Error Source: MSExchangeTransport Event ID: 3017 Event Time: 3/2/2005 9:23:12 AM User: n/a Computer: "Exchange Server" Description: A non-delivery report with a status code of 5.3.5 was generated for recipient rfc822;"user"@phoenix.austincollege.edu (Message-ID <200503020922.AA32375048@"popserver".austincollege.edu>). Causes: A looping condition was detected. (The server is configured to route mail back to itself). If you have multiple SMTP Virtual Servers configured on your Exchange server, make sure they are defined by a unique incoming port and that the outgoing SMTP port configuration is valid to avoid looping between local virtual servers. Solution: Check the configuration of the virtual serverÆs connectors for loops and ensure each virtual server is defined by a unique incoming port.