Yes just uncomment these 3 lines in Sell.pm

 $Temp = qq!$Script_URL?action=ViewItem&ID=$Item_ID&Cat_ID=$Param{Cat_ID}&Lang=$Global{Language}!;
 $Msg =~ s/<!--Title-->/$Param{Title}/g;
 $Msg =~ s/<!--Item_URL-->/$Temp/g;

by removing the # from the line start.

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