After a recent SP4 upgrade to Sql Server the Database mail stopped working.
The following error message would generate in the logs.
After several attempts of troubleshooting the solution was to run the script
C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\install\sysdbupg.sql
This MS Article http://support.microsoft.com/kb/2008286 explains it can be caused after a Service Pack upgrade.
Message
1) Exception Information
===================
Exception Type: Microsoft.SqlServer.Management.SqlIMail.Server.Common.BaseException
Message: Mail configuration information could not be read from the database.
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.Controller.CommandFactory.CreateSendMailCommand(DBSession dbSession)
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandRunner.Run(DBSession db)
at Microsoft.SqlServer.Management.SqlIMail.IMailProcess.ThreadCallBack.MailOperation(Object o)
2) Exception Information
===================
Exception Type: System.IndexOutOfRangeException
Message: timeout
Data: System.Collections.ListDictionaryInternal
TargetSite: Int32 GetOrdinal(System.String)
HelpLink: NULL
Source: System.Data
StackTrace Information
===================
at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName)
at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
at System.Data.SqlClient.SqlDataReader.get_Item(String name)
at Microsoft.SqlServer.Management.SqlIMail.Server.DataAccess.DataAccessAdapter.GetAccount(Int32 accountID)
