Blog: Troubleshoot the MS POP3 Connector.

An amount of our customers use POP3 to their email servers, such as exchange. Using POP3 connectors can be difficult to troubleshoot. Below is a guid of what steps to perform if you have issues.

Re-register the POP3 Connector event sink in Microsoft Internet Information Services (IIS). To do this, click Start, click Run, type %programfiles%\microsoft windows small business server\networking\pop3\imbreg.exe, and then click OK. 

Test your email using Telnet.

C:\>telnet exchangeserverIP 25

Telnet>helo <cr>

Telnet> mail from:youremail@xxxxxxxxxxxxxx

Telnet>rcpt to:youremail@xxxxxxxxxxxxxx

Telnet>data <cr>

Telnet> test test test <cr>

Telnet> test test test <cr>

Telnet>. <cr>

Troubleshoot the SMTP delivery process

The POP3 Connector may download e-mail messages from the remote POP3 server, but those e-mail messages may not be delivered to the user. In this scenario, no files remain in the Incoming Mail folder or the Failed Mail folder. To troubleshoot this issue, follow these steps:

Examine the contents of the PickUp folder. If no files appear in this folder, Windows tried to deliver the e-mail message to the recipient. At this point, the e-mail message is outside the boundaries of the POP3 Connector. In this scenario, follow these steps:

Examine the SMTP queues on the Windows Small Business Server-based computer. 

Enable e-mail message tracking on the Windows Small Business Server-based computer. 

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