PHPMailer\PHPMailer

POP3::login │ public │ WP 1.0

Log in to the POP3 server. Does not support APOP (RFC 2828, 4949).

Method of the class: POP3{}

No Hooks.

Returns

true|false.

Usage

$POP3 = new POP3();
$POP3->login( $username, $password );
$username(string)
.
Default: ''
$password(string)
.
Default: ''

POP3::login() code WP 6.9.1

wp-includes/PHPMailer/POP3.php 
public function login($username = '', $password = '')
{
    if (!$this->connected) {
        $this->setError('Not connected to POP3 server');
        return false;
    }
    if (empty($username)) {
        $username = $this->username;
    }
    if (empty($password)) {
        $password = $this->password;
    }

    //Send the Username
    $this->sendString("USER $username" . static::LE);
    $pop3_response = $this->getResponse();
    if ($this->checkResponse($pop3_response)) {
        //Send the Password
        $this->sendString("PASS $password" . static::LE);
        $pop3_response = $this->getResponse();
        if ($this->checkResponse($pop3_response)) {
            return true;
        }
    }

    return false;
}