Database mail running on cluster error

Hi

we are running Sql 2005 enterprise edition sp1 on a 2 node cluster.When we send a test message via database mail we recieve the following error

Date 3/7/2007 9:11:18 AM
Log Database Mail (Database Mail Log)

Log ID 5
Process ID 2892
Last Modified 3/7/2007 9:11:18 AM
Last Modified By JDG\pssqlservice

Message
1) Exception Information
===================
Exception Type: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Data: System.Collections.ListDictionaryInternal
TargetSite: Microsoft.SqlServer.Management.SqlIMail.Server.Objects.Account GetAccount(Int32)
HelpLink: NULL
Source: DatabaseMailEngine

StackTrace Information
===================
at Microsoft.SqlServer.Management.SqlIMail.Server.DataAccess.DataAccessAdapter.GetAccount(Int32 accountID)
at Microsoft.SqlServer.Management.SqlIMail.Server.DataAccess.SessionManager.GetAccount(Int32 accountID)
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandFactory.CreateSendMailCommand(DBSession dbSession)
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandFactory.CreateCommand(DBSession dbSession)
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandRunner.Run(DBSession db)
at Microsoft.SqlServer.Management.SqlIMail.IMailProcess.ThreadCallBack.MailOperation(Object o)

Does anybody know what could be the problem here?

Just a guess here: No known FROM address provided...|||we do have a reply address configured in the batabase mail configuration.so it is not this