How to receive an email with WordPress?

By default, WordPress is not equipped to be an email server. It can send email but does not receive email.

If you want to send mail to multiple recipients then wp_mail will allow you to specify multiple addresses.

<?php

$multiple_recipients = array(
    '[email protected]',
    '[email protected]'
);
$subj = 'The email subject';
$body = 'This is the body of the email';

wp_mail( $multiple_recipients, $subj, $body ); 

But if you want to check your email through the admin panel then you really need a plugin to read email from an external source — not specific to WordPress.