Topic Last Modified: 2007-11-20

This topic provides information about how to troubleshoot Microsoft Exchange Server 2007 mail flow issues due to mailbox logon failure. The following symptoms are sometimes an indication of this failure:

This issue occurs when the Microsoft Exchange Transport service is configured to log on using another account, instead of the Network Service account. For example, the Microsoft Exchange Transport service is configured to log on using the Administrator account.


To resolve the problem, change the logon account back to the Network Service account.

Before You Begin

To perform this procedure, the account you use must be delegated the following:

  • Membership in the local Administrators group

For more information about permissions, delegating roles, and the rights that are required to administer Exchange 2007, see Permission Considerations.


To configure the logon account back to the Network Service account

  1. On the Exchange 2007 Hub Transport server, click Start, click Run, type Services.msc, and then click OK.

  2. In the list of services, right-click Microsoft Exchange Transport, and then click Properties.

  3. Click the Log On tab, and then click This account.

  4. Click Browse, type Network Service, click Check Names, and then click OK.

  5. Remove the password from the Password and Confirm Password edit boxes.

    Microsoft Windows automatically generates a password for the Network Service account. Therefore, you do not have to specify a password for this account.
  6. Click OK. Then restart the Microsoft Exchange Transport service.