Quick query to pull the last 7 days of alert email action history via SWQL.
SELECT ac.Name AS [Alert Configuration] ,ah.Message AS [Action Message] ,ah.AlertObjects.EntityNetObjectId ,ah.EventType ,ah.TimeStamp ,ah.ActionID ,a.ActionTypeID AS [ActionType] ,a.Title AS [ActionName] ,n.NodeName AS [Node] FROM Orion.AlertHistory AS ah INNER JOIN Orion.Nodes AS n ON CONCAT('N:', TOSTRING(n.NodeID)) = ah.AlertObjects.EntityNetObjectId LEFT JOIN Orion.Actions AS a ON a.ActionID = ah.ActionID LEFT JOIN Orion.AlertObjects AS ao ON ah.AlertObjectID = ao.AlertObjectID LEFT JOIN Orion.AlertConfigurations AS ac ON ac.AlertID = ao.AlertID WHERE a.ActionTypeID = 'Email' AND DAYDIFF(ah.TimeStamp, GETUTCDATE()) <= 7 ORDER BY ah.TimeStamp DESC