Exchange - how to increase the maximum acceptable message size?

Hello, I'm recieving the following SBS event log error and am unsure how to
do what it is recommending. Any suggestions?

Thanks.
Bill

Log Name: Microsoft-Windows-Small Business Server/Operational
Source: Windows Small Business Server 2008
Date: 7/6/2009 8:34:14 PM
Event ID: 210
Task Category: Windows SBS POP3 Connector
Level: Error
Keywords:
User: LOCAL SERVICE
Computer: MyServer.MyDomain.local

Description:
One or more messages (1) were left in the 'email' account on the POP3 server
'plus.pop.mail.yahoo.com' because they are larger than the maximum acceptable
message size (the largest message is 16827811 bytes). You can either connect
to the POP3 account and retrieve or delete the messages manually, or increase
the maximum acceptable message size in Exchange Server.

Maybe some help here...

Changing Pop3 Connector message size in Small Business Server 2008

Perfect. That did it.

In my case, the following commands were used to view the existing and set
the maxmessagesize to 20MB (a Yahoo limit):

get-receiveconnector | select identity,maxmessagesize
set-receiveconnector "Default WF1" -maxmessagesize 20MB
set-receiveconnector "Windows SBS Fax Sharepoint Receive WF1"
-maxmessagesize 20MB
set-receiveconnector "Windows SBS Internet Receive WF1" -maxmessagesize 20MB

Thank you for your feedback and also thanks for Merv's great input. Glad to know this issue is fixed.

However, I am wondering if you could perform a small test to resume the "Windows SBS Internet Receive WF1" and "Default WF1" maxmessagesize back to 10 MB and see if the issue persists? Because
as far as I know, SBS 2008 includes a brand new version of the POP3 connector and it performs the following steps during its mail-flow lifecycle:

a. A connection is established to external POP3 Server.
b. Each user's mailbox is accessed with the credentials stored in the POP3 Connector's configuration.
c. Email is downloaded and deleted from the source mailbox and then submitted directly to the Exchange Transport service via SMTP.

Moreover, as we know the Exchange 2007 server Receive Connector will take effect automatically accrodding to the IP address range. That is to say, there should be ONLY ONE receive connector that
really applies to the POP3 emails size restriction. I wonder it is the "Windows SBS Fax Sharepoint Receive WF1".

Unfortunately, my SBS 2008 test environment is corrupted and still under recovery and cannot do the test. So if possible, could you please resume the "Windows SBS Internet Receive WF1" and "Default
WF1" maxmessagesize back to 10 MB and only left the "Windows SBS Fax Sharepoint Receive WF1" with 20MB and see if the issue would reoccur? Your time and efforts are highly appreciated.

Sorry, I was not notified of your response. As I recall, it was necessary to
set all three to 20MB before the POP3 Connector would go ahead and download
the message.

Do you still need me to verify it?

Thanks for your update and confirmation. I 'll do some tests offline later.

You are welcome