INSERT INTO list_subscribers (subscriberid, listid, emailaddress, domainname, format, confirmed, confirmcode, requestdate, requestip, confirmdate, confirmip, subscribedate, unsubscribed, unsubscribeconfirmed)
VALUES ('203404', 1, 'blah@gmail.com', '@gmail.com', 'h', 1, '1234', 1282196458, '', 1282196458, '', 1282196458, 0, 0 )
ON DUPLICATE KEY UPDATE emailaddress='blah@gmail.com', domainname = '@gmail.com', unsubscribed = 0, unsubscribeconfirmed = 0

Error Code: 1062. Duplicate entry 'blah@gmail.com-1' for key 'subscribers_email_list_idx'

CREATE TABLE `list_subscribers` (
    `subscriberid` int(11) NOT NULL AUTO_INCREMENT,
    `listid` int(11) NOT NULL DEFAULT '0',
    `emailaddress` varchar(200) DEFAULT NULL,
    `domainname` varchar(100) DEFAULT NULL,
    `format` char(1) DEFAULT NULL,
    `confirmed` char(1) DEFAULT '0',
    `confirmcode` varchar(32) DEFAULT NULL,
    `requestdate` int(11) DEFAULT '0',
    `requestip` varchar(20) DEFAULT NULL,
    `confirmdate` int(11) DEFAULT '0',
    `confirmip` varchar(20) DEFAULT NULL,
    `subscribedate` int(11) DEFAULT '0',
    `bounced` int(11) DEFAULT '0',
    `unsubscribed` int(11) DEFAULT '0',
    `unsubscribeconfirmed` char(1) DEFAULT '0',
    `formid` int(11) DEFAULT '0',
    PRIMARY KEY (`subscriberid`),
    UNIQUE KEY `subscribers_email_list_idx` (`emailaddress`,`listid`),
    KEY `list_subscribers_sub_list_idx` (`subscriberid`,`listid`),
    KEY `subscribe_date_idx` (`subscribedate`),
    KEY `list_subscribers_listid_idx` (`listid`),
    KEY `confirmed_idx` (`confirmed`)
) ENGINE=InnoDB AUTO_INCREMENT=4687107 DEFAULT CHARSET=utf8