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Email Alerts are not received...

In one of application, Email alerts are sent using SQL sp_send_dbmail stored procedure. Email alerts were working properly, but suddenly noticed email alerts are not received.

To troubleshoot the issue, first I checked the msdb.dbo.sysmail_event_log table using the below query.

SELECT log_id, event_type, log_date, description, process_id, mailitem_id, account_id, last_mod_date, last_mod_user
log_date DESC

If there is any error, you should see records with the event_type value as error.
In my case there are records with event_type value as error, and the description value for those records is same as below

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 3 (2018-02-01T10:41:27). Exception Message: Cannot send mails to mail server. (The SMTP server requires a secure connection or the client was not authenticated. The server response was: Authentication required).  )

As per the error descript…

Allow E-mail address to be changed for the Users having Browser permission in SSRS Subscriptions...

Normally Users having Browser permission cannot changed the e-mail address (To: field) in the report subscription page. Default the user name is applied as the value for the To: field.
To allow this to be modifiable by users having Browser permission, you need to modify the rsreportserver.config file.

Open the rsreportserver.config in a text editor.
Then set the SendEmailToUserAlias to False and Save the rsreportserver.config file.

That is it.
Now just try to create a New Subscription and you will see there is no value in the To: field and it is editable.