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The reason for these notifications is to inform the administrator that there is an issue with the connectivity between SMEX and its database.

In order to mitigate database connectivity issues, SMEX supports continuous scanning. This means that SMEX will continue scanning emails even when the connection to the database is lost.

In order to avoid losing logs, SMEX will write the logs into files which are located under the Smex\PUSH\HA folder.

When database connection is restored, SMEX will insert these logs into the database.
However, if for some reason the logs cannot be recovered, those will be moved to the Smex\PUSH\HA\QUARANTINE\.

The file name starting with "U_GUID" is an unfinished file, meaning that SMEX is currently writing logs into this file. After SMEX finishes log writing, SMEX will remove the "U_" from the file name.

By default SMEX will send those notifications to the administrator informing her/him that the log files could not be handled correctly after 7 days and then move them to quarantine folder.