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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…

CDC Failed when changing the database or the CDC State table in SSIS Package...

Recently we faced that the SSIS packages got failed which use CDC, due to a validation issue when the data source is pointing to a different database or the CDC State table is pointing to a different one.

The solution is to set the Delay Validation property to True.
But I found that sometimes this is not enough in the package level and need to set it in the Data Flow and the set ValidateExternalMetaData to False in the CDC Source as well.

Hope this is helpful for you as well.