Event 5740 and 5649 with POP3 authentication and Biztalk Server

During the configuration of the Biztalk 2010 POP3 connector, I had some trouble finding the correct authentication method. The following errors kept showing up in my eventlog:

Source:        BizTalk Server
Event ID:      5740
Task Category: BizTalk Server
Level:         Warning
Description:
The adapter “POP3” raised an error message. Details “The POP3 server does not support the specified authentication scheme.
Please change the scheme to the one supported by POP3 server.
URL: POP3://exchangeserver#domain\useraccount
Scheme: SPA
Error: -ERR Command is not valid in this state. “.

and

Source:        BizTalk Server
Event ID:      5649
Task Category: BizTalk Server
Level:         Error
Description:
The receive location “Message-POP” with URL “POP3://exchangeserver#domain\useraccount” is shutting down. Details:”The POP3 adapter is shutting down because it exceeded error threshold.
URL: POP3://exchangeserver#domain\useraccount”.

In my Exchange 2007 organization, the POP3 connector is set as follows:

image

Because the server side is set to “Secure Logon. A TLS connection is required for the client to authenticate to the server”, you have to set the client to SPA (Secure Password Authentication) with SSL enabled.

Therefor, I set the POP3 client in Biztalk to the following:

image

At the Security section, make sure you have the Authentication Scheme set to SPA, “Use SSL” to True, and User Name as domain\username.

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