sql 2005 设置邮箱后 发送测试报错解决方案

sql 2005 设置邮箱后 发送测试报错
错误日志如下：    

1) Exception Information  ===================  Exception Type: System.NullReferenceException  Message: 未将对象引用设置到对象的实例。  Data: System.Collections.ListDictionaryInternal  TargetSite: Microsoft.SqlServer.Management.SqlIMail.Server.Objects.Account GetAccount(Int32)  HelpLink: NULL  Source: DatabaseMailEngine    StackTrace Information  ===================     在 Microsoft.SqlServer.Management.SqlIMail.Server.DataAccess.DataAccessAdapter.GetAccount(Int32 accountID)     在 Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandFactory.CreateSendMailCommand(DBSession dbSession)     在 Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandFactory.CreateCommand(DBSession dbSession)     在 Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandRunner.Run(DBSession db)     在 Microsoft.SqlServer.Management.SqlIMail.IMailProcess.ThreadCallBack.MailOperation(Object o)
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http://blog.csdn.net/zhaowenzhong/article/details/7043222