1005, "Can't create table 'test.addr_count' (errno: 150)"

Question

/* create table mailing */

CREATE TABLE IF NOT EXISTS mailing(
                            id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
                            addr VARCHAR(255) NOT NULL,
                            domain VARCHAR(255) NOT NULL)ENGINE = InnoDB

/* create table addr_count */

CREATE TABLE IF NOT EXISTS addr_count(
                            id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
                            e_addr VARCHAR(255) NOT NULL,
                            e_domain VARCHAR(255) NOT NULL,
                            count INT NOT NULL,
                            INDEX (e_addr),
                            INDEX (e_domain),
                            FOREIGN KEY (e_addr) REFERENCES mailing (addr) ON DELETE CASCADE ON UPDATE CASCADE,
                            FOREIGN KEY (e_domain) REFERENCES mailing (domain) ON DELETE CASCADE ON UPDATE CASCADE)
                            ENGINE = InnoDB

Could you please help me with this error? Everything seems correct to me but not sure what I am missing!