General database mail troubleshooting steps

Άρθρο
02/24/2023

Applies to: SQL Server Azure SQL Managed Instance

Troubleshooting Database Mail involves checking the following general areas of the Database Mail system. These procedures are presented in a logical order, but can be evaluated in any order.

Permissions

You must be a member of the sysadmin fixed server role to troubleshoot all aspects of Database Mail. Users who aren't members of the sysadmin fixed server role can only obtain information about the e-mails they attempt to send, not about e-mails sent by other users.

Is database mail enabled

In SQL Server Management Studio, connect to an instance of SQL Server by using a query editor window, and then execute the following code:
```
sp_configure 'show advanced', 1; 
GO
RECONFIGURE;
GO
sp_configure;
GO
```
In the results pane, confirm that the run_value for Database Mail XPs is set to 1. If the run_value isn't 1, Database Mail isn't enabled. Database Mail isn't automatically enabled to reduce the number of features available for attack by a malicious user. For more information, see Understanding Surface Area Configuration.
If you decide that it's appropriate to enable Database Mail, execute the following code:
```
sp_configure 'Database Mail XPs', 1; 
GO
RECONFIGURE;
GO
```
To restore the sp_configure procedure to its default state, which doesn't show advanced options, execute the following code:
```
sp_configure 'show advanced', 0; 
GO
RECONFIGURE;
GO
```

Are users properly configured to send mail

To send Database Mail, users must be a member of the DatabaseMailUserRole database role in the msdb database. Members of the sysadmin fixed server role and msdb db_owner role are automatically members of the DatabaseMailUserRole role. To list all other members of the DatabaseMailUserRole execute the following statement:
```
EXEC msdb.sys.sp_helprolemember 'DatabaseMailUserRole';
```

To add users to the DatabaseMailUserRole role, use the following statement:

USE msdb;
GO

sp_addrolemember @rolename = 'DatabaseMailUserRole'
,@membername = '<database user>';

To send Database Mail, users must have access to at least one Database Mail profile. To list the users (principals) and the profiles to which they have access, execute the following statement.
```
EXEC msdb.dbo.sysmail_help_principalprofile_sp;
```
Use the Database Mail Configuration Wizard to create profiles and grant access to profiles to users.

Is database mail started

The Database Mail External Program is activated when there are e-mail messages to be processed. When there have been no messages to send for the specified time-out period, the program exits. To confirm the Database Mail activation is started, execute the following statement:
```
EXEC msdb.dbo.sysmail_help_status_sp;
```
If the Database Mail activation isn't started, execute the following statement to start it:
```
EXEC msdb.dbo.sysmail_start_sp;
```
If the Database Mail external program is started, check the status of the mail queue with the following statement:
```
EXEC msdb.dbo.sysmail_help_queue_sp @queue_type = 'mail';
```
The mail queue should have the state of RECEIVES_OCCURRING. The status queue may vary from moment to moment. If the mail queue state isn't RECEIVES_OCCURRING, try restarting the queue. Stop the queue using the following statement:

EXEC msdb.dbo.sysmail_stop_sp;

Then start the queue using the following statement:

EXEC msdb.dbo.sysmail_start_sp;

Note

Use the length column in the result set of sysmail_help_queue_sp to determine the number of e-mails in the Mail queue.

Do problems affect some or all accounts

If you've determined that some but not all profiles can send mail, then you may have problems with the Database Mail accounts used by the problem profiles. To determine which accounts are successful in sending mail, execute the following statement:
```
SELECT sent_account_id, sent_date FROM msdb.dbo.sysmail_sentitems;
```
If a non-working profile doesn't use any of the accounts listed, then it's possible that all the accounts available to the profile aren't working properly. To test individual accounts, use the Database Mail Configuration Wizard to create a new profile with a single account, and then use the Send Test E-Mail dialog box to send mail using the new account.
To view the error messages returned by Database Mail, execute the following statement:
```
SELECT * FROM msdb.dbo.sysmail_event_log;
```
Note

Database Mail considers mail to be sent when it is successfully delivered to a SMTP mail server. Subsequent errors, such as an invalid recipient e-mail address, can still prevent mail from being delivered, but will not be contained in the Database Mail log.

Retry mail delivery

If you've determined that the Database Mail is failing because the SMTP server can't be reliably reached, you may be able to increase your successful mail delivery rate by increasing the number of times Database Mail attempts to send each message. Start the Database Mail Configuration Wizard, and select the View or change system parameters option. Alternatively, you can associate more accounts to the profile so upon failover from the primary account, Database Mail uses the failover account to send e-mails.
On the Configure System Parameters page, the default values of five times for the Account Retry Attempts and 60 seconds for the Account Retry Delay means that message delivery will fail if the SMTP server can't be reached in 5 minutes. Increase these parameters to lengthen the amount of time before message delivery fails.

Note

When large numbers of messages are being sent, large default values may increase reliability, but will substantially increase the use of resources as many messages are attempted to be delivered over and over again. Address the root problem by resolving the network or SMTP server problem that prevents Database Mail from contacting the SMTP server promptly.

Verify service broker is enabled for msdb

Database mail requires the Service Broker to be enabled for the msdb database. Verify if the service broker is enabled on msdb with the following T-SQL script:

SELECT is_broker_enabled FROM sys.databases WHERE name = 'msdb' ; -- should be 1

If not enabled, the service broker must be enabled. The following sample script requires exclusive access to the msdb system databases, however, so this may not be feasible to execute during typical business hours. For more information, see ALTER DATABASE ... SET ENABLE_BROKER.

ALTER DATABASE msdb SET ENABLE_BROKER;

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