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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
FROM
msdb.dbo.sysmail_event_log 
ORDER BY
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…

[Connection manager "Excel Connection Manager"] Error: The requested OLE DB provider Microsoft.ACE.OLEDB.12.0 is not registered...

While trying to execute a package in 64 bit SSIS, I got the below error
[Connection manager "Excel Connection Manager"] Error: The requested OLE DB provider Microsoft.ACE.OLEDB.12.0 is not registered. If the 64-bit driver is not installed, run the package in 32-bit mode. Error code: 0x00000000.An OLE DB record is available. Source: "Microsoft OLE DB Service Components" Hresult: 0x80040154 Description: "Class not registered".

To fix it just right click on the SSIS project in the solution explorer and click Properties. Then click on the Debugging of the Configuration Properties. You will find Run64BitRuntime under Debug Options. Set it to False and execute the package. You will not get the above error anymore. 

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