In the universal email behavior, for the Logging settings, did you select the option to create the log table? if you don't already have the log table, you use the Create the Log table option.
you can create it manully using the following SQL:
CREATE TABLE `email_log` (
`EmailID` int(11) NOT NULL AUTO_INCREMENT,
`EmailTo` varchar(250) DEFAULT NULL,
`EmailFrom` varchar(250) DEFAULT NULL,
`EmailSubject` varchar(250) DEFAULT NULL,
`EmailBody` text,
`EmailHeader` text,
`EmailError` text,
`EmailStatus` varchar(50) DEFAULT NULL,
`EmailDate` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`EmailID`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1