Invalid from address on https site

On an https site the emails get set from an invalid address like:
noreply@https://mydomain.com
This function only replaces https:// but should also replace https.

/**
	 * Get a fake email address for this domain
	 *
	 * @param string       $mailbox         A fake mailbox
	 * @return string      $email_address   A fake email address at this domain
	 */
	protected function get_domain_email_address( $mailbox ) {
		return $mailbox . '@' . rtrim( str_replace( 'https://', '', home_url() ), '/' );
	}

https://www.ads-software.com/plugins/p2-by-email/