Database Mail XPs (server configuration option)
Applies to: 
SQL Server
Use the DatabaseMail XPs option to enable Database Mail on this server. The possible values are:
0: Database Mail isn't available (default).1: Database Mail is available.
The setting takes effect immediately without a server stop and restart.
After enabling Database Mail, you must configure a Database Mail host database to use Database Mail.
Configuring Database Mail using the Database Mail Configuration Wizard enables the Database Mail extended stored procedures in the msdb database. If you use the Database Mail Configuration Wizard, you do not have to use the sp_configure example below.
Setting the Database Mail XPs option to 0 prevents Database Mail from starting. If it is running when the option is set to 0, it continues to run and send mail until it is idle for the time configured in the DatabaseMailExeMinimumLifeTime option.
Examples
The following example enables the Database Mail extended stored procedures.
sp_configure 'show advanced options', 1;
GO
RECONFIGURE;
GO
sp_configure 'Database Mail XPs', 1;
GO
RECONFIGURE
GO
The following example enables the Database Mail extended stored procedures if it is not already enabled.
IF EXISTS (
SELECT 1 FROM sys.configurations
WHERE NAME = 'Database Mail XPs' AND VALUE = 0)
BEGIN
PRINT 'Enabling Database Mail XPs'
EXEC sp_configure 'show advanced options', 1;
RECONFIGURE
EXEC sp_configure 'Database Mail XPs', 1;
RECONFIGURE
END