Where to find log information about email sent from service desk

Where to find log information about email sent from service desk

Hi,
 
Email sent from servicedesk to external email address and the user did not received it. Email sent few days before.
Now to check log if I go Support > Support Files > open Log file in Server\logs but that showing all information from yesterdays only how to get information on specifict date log files?
 
Regards,
Prakash

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