src/Mailer/SMTP.php
public function setAuth($username, $password)
    {
        $this->username = $username;
        $this->password = $password;
        $this->logger && $this->logger->debug("Set: the auth login");
        return $this;
    }
public function setAuth($username, $password)
    {
        $this->username = $username;
        $this->password = $password;
        $this->logger && $this->logger->debug("Set: the auth login");
        return $this;
    }
auth login with server
@param string $username
@param string $password
@return $this