postfixadmin安装时导入数据出错！

wudouhun

ERROR 1071 (42000) at line 143: Specified key was too long; max key length is 1024 bytes


DATABASE_MYSQL.TXTM最后一个表导入不进去。

# vacation_notification table

CREATE TABLE vacation_notification (
    on_vacation varchar(255) NOT NULL,
    notified varchar(255) NOT NULL,
    notified_at timestamp NOT NULL default now(),
    CONSTRAINT vacation_notification_pkey PRIMARY KEY(on_vacation, notified),
    FOREIGN KEY (on_vacation) REFERENCES vacation(email) ON DELETE CASCADE
)  ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci TYPE=InnoDB COMMENT='Postfix Admin - Virtual Vacation Notifications';

是那个超出范围了？？？