Iniciando el dbmail

A veces, me encuentro que al intentar enviar un correo como el siguiente:

EXEC msdb.dbo.sp_send_dbmail @recipients ='diego@daf.com.ar',@subject='Asunto', 
@body = 'Detalle'

Con mensajes de error de este tipo:

Msg 14641, Level 16, State 1, Procedure sp_send_dbmail, Line 62
Mail not queued. Database Mail is stopped. 
Use sysmail_start_sp to start Database Mail.

TITLE: Microsoft SQL Server Management Studio
------------------------------

An exception occurred while executing a Transact-SQL statement or batch. 
(Microsoft.SqlServer.ConnectionInfo)

------------------------------
ADDITIONAL INFORMATION:

Mail not queued. Database Mail is stopped. Use sysmail_start_sp 
to start Database Mail. (Microsoft SQL Server, Error: 14641)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&
ProdVer=09.00.4035&EvtSrc=MSSQLServer&EvtID=14641&LinkId=20476

Para solventarlo y como primer paso, verifico si esta configurado:

sp_configure 'show advanced', 1; 
GO
RECONFIGURE;
GO
sp_configure;
GO

name                                minimum     maximum     config_value run_value
----------------------------------- ----------- ----------- ------------ -----------
Database Mail XPs                   0           1           1            1

EXEC msdb.dbo.sysmail_help_principalprofile_sp;

principal_id     principal_name  profile_id profile_name is_default
---------------- --------------- ---------- ------------ --------
2                guest           6          SqlProfile   1

Como lo esta, reviso el estado:

EXEC msdb.dbo.sysmail_help_status_sp;

Status
-------
STOPPED

(1 row(s) affected)

Lo encuentro detenido.
Lo inicio:

EXEC msdb.dbo.sysmail_start_sp;

Command(s) completed successfully.

Lo verifico:

EXEC msdb.dbo.sysmail_help_status_sp;

Status
-------
STARTED

(1 row(s) affected)

EXEC msdb.dbo.sysmail_help_queue_sp @queue_type = 'mail';

queue_type length      state                                                            last_empty_rowset_time  last_activated_time
---------- ----------- ---------------------------------------------------------------- ----------------------- -----------------------
mail       0           RECEIVES_OCCURRING                                               2012-11-28 12:19:47.767 2012-11-28 12:19:39.867

(1 row(s) affected)

Y si finalmente, reviso los logs a ver que paso:

SELECT top 20 * FROM msdb.dbo.sysmail_event_log
order by log_id desc;

Fuente Microsoft.com http://technet.microsoft.com/en-us/library/ms187540.aspx