SBS POP3 connector error: invalid header fields

If you are using the POP3 Connector on Windows SBS 2008, you may encounter this error in the event log:

One or more (5) e-mail messages in the POP3 mailbox account ‘’ on the POP3 server ‘’ have invalid header fields. Because of this, the messages cannot be delivered to the Exchange Server mailbox ‘’ in Windows Small Business Server. The messages are still on the POP3 server. To resolve this issue, connect to the POP3 mailbox account, and then manually retrieve or delete the messages.

By default the POP3 connector will stop processing new messages after 5 protocol errors so once this happens, you will not receive any email.

Increase the MaxProtocolErrors from 5 to something bigger:

Set-ReceiveConnector -identity ($Env:computername + “\Windows SBS Fax Sharepoint Receive ” + $Env:computername) -MaxProtocolErrors 300

Next step: remaining messages to be downloaded, but the messages with invalid headers will still not be downloaded.
To fix this:

Set-ReceiveConnector -Identity ($Env:computername + “\Windows SBS Fax Sharepoint Receive ” + $Env:computername) -DefaultDomain $Env:UserDNSDomain

Exchange 2010 unable to access EMC or EMS

Exchange 2010 Management Console

Initialization failed.

The following error occurred while attempting to connect to the specified Exhange Server ‘name of the server’

The attempt to connect to server using ‘kerberos’ authentication failed:Connecting to remote server failed with the following error message : The WS-Management service cannot process the request. The system load quota of 1000 requests per 2 seconds has exceeded. Send future requests at a slower rate or raise the system quota. The next request from this user will not be approved for atleast 324122176 milliseconds. for more information, see the about_remote_troubleshooting Help topic.

try restart IIS (or IISReset command)