diff --git a/include/class-Mailbox.php b/include/class-Mailbox.php
index 90cfef1..ef0522f 100644
--- a/include/class-Mailbox.php
+++ b/include/class-Mailbox.php
@@ -1,210 +1,219 @@
 <?php
 # Copyright (C) 2018, 2019, 2020 Valerio Bozzolan
 # Boz Libre Hosting Panel
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as
 # published by the Free Software Foundation, either version 3 of the
 # License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 # GNU Affero General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 // load dependent traits
 class_exists( 'Domain' );
 
 trait MailboxTrait {
 
 	use DomainTrait;
 
 	/**
 	 * Get the Mailbox ID
 	 *
 	 * @return int
 	 */
 	public function getMailboxID() {
 		return $this->get( 'mailbox_ID' );
 	}
 
 	/**
 	 * Get the mailbox username
 	 *
 	 * @return string
 	 */
 	public function getMailboxUsername() {
 		return $this->get( 'mailbox_username' );
 	}
 
 	/**
 	 * Get the mailbox address
 	 *
 	 * @return string E-mail
 	 */
 	public function getMailboxAddress() {
 		return sprintf( "%s@%s",
 			$this->get( 'mailbox_username' ),
 			$this->get( 'domain_name' )
 		);
 	}
 
 	/**
 	 * Get the mailbox description (if any)
 	 *
 	 * @return string
 	 */
 	public function getMailboxDescription() {
 		return $this->get( 'mailbox_description' );
 	}
 
 	/**
 	 * Get the mailbox permalink
 	 *
 	 * @return string
 	 */
 	public function getMailboxPermalink( $absolute = false ) {
 		return Mailbox::permalink(
 			$this->get( 'domain_name' ),
 			$this->get( 'mailbox_username' )
 		);
 	}
 
 	/**
 	 * Update this mailbox password
 	 *
 	 * @param  string $password
 	 * @return string
 	 */
 	public function updateMailboxPassword( $password = null ) {
 		if( ! $password ) {
 			$password = generate_password();
 		}
 
 		$enc_password = Mailbox::encryptPassword( $password );
 
 		// update
 		( new MailboxAPI() )
 			->whereMailbox( $this )
 			->update( [
 				new DBCol( 'mailbox_password', $enc_password, 's' ),
 			] );
 
 		return $password;
 	}
 
 	/**
 	 * Get the last size in bytes
 	 *
 	 * @return int
 	 */
 	public function getMailboxLastSizeBytes() {
 		return $this->get( 'mailbox_lastsizebytes' );
 	}
 
 	/**
 	 * Normalize a Mailbox after being fetched from database
 	 */
 	protected function normalizeMailbox() {
 		$this->normalizeDomain();
 		$this->integers( 'mailbox_ID',
 		                 'mailbox_lastsizebytes' );
 		$this->booleans( 'mailbox_receive' );
 	}
 
 	/**
 	 * Get the mailbox filesystem pathname in the MTA host
 	 *
 	 * TODO: actually all the mailbox are on the same host.
 	 * Then, we should support multiple hosts.
 	 *
 	 * @return string
 	 */
 	public function getMailboxPath() {
 
 		// require a valid filename or throw
 		$mailbox_user = $this->getMailboxUsername();
 		require_safe_dirname( $mailbox_user );
 
 		// mailboxes are stored under a $BASE/domain/username filesystem structure
 		return $this->getDomainMailboxesPath() . __ . $mailbox_user;
 	}
 }
 
 /**
  * A mailbox
  */
 class Mailbox extends Queried {
 
 	use MailboxTrait;
 
 	/**
 	 * Database table
 	 */
 	const T = 'mailbox';
 
 	/**
 	 * Constructor
 	 */
 	public function __construct() {
 		$this->normalizeMailbox();
 	}
 
 	/**
 	 * Get the mailbox permalink
 	 *
 	 * @param $domain string
 	 * @param $mailbox string
 	 * @param $absolute boolean
 	 * @return string
 	 */
 	public static function permalink( $domain, $mailbox = null, $absolute = false ) {
 		$part = site_page( 'mailbox.php', $absolute ) . _ . $domain;
 		if( $mailbox ) {
 			$part .= _ . $mailbox;
 		}
 		return $part;
 	}
 
 	/**
 	 * Encrypt a password
 	 *
 	 * @param string $password Clear text password
 	 * @return string          One-way encrypted password
 	 */
 	public static function encryptPassword( $password ) {
 		global $HOSTING_CONFIG;
 
 		// the Mailbox password encryption mechanism can be customized
 		if( isset( $HOSTING_CONFIG->MAILBOX_ENCRYPT_PWD ) ) {
 			return call_user_func( $HOSTING_CONFIG->MAILBOX_ENCRYPT_PWD, $password );
 		}
 
 		// or then just a default behaviour
 
 		/**
 		 * The default behaviour is to adopt the crypt() encryption mechanism
 		 * with SHA512 and some random salt. It's strong enough nowadays.
 		 *
 		 * Read your MTA/MDA documentation, whatever you are using.
 		 * We don't know how your infrastructure works, so we don't know
 	 	 * how you want your password encrypted in the database and what kind
 		 * of password encryption mechanisms your MTA/MDA supports.
 		 *
 		 * In short if you are using Postfix this default configuration may work
 		 * because you may have Postfix configured as follow:
 		 *
 		 * Anyway you can use whatever MTA/MDA that talks with a MySQL database
 		 * and so you should adopt the most stronger encryption mechanism available.
 		 *
 		 *   https://doc.dovecot.org/configuration_manual/authentication/password_schemes/
 		 */
 
 		$salt = bin2hex( openssl_random_pseudo_bytes( 3 ) );
 		return '{SHA512-CRYPT}' . crypt( $password, "$6$$salt" );
 	}
 
+	/**
+	 * Force to get a Mailbox ID, whatever is passed
+	 *
+	 * @param  mixed $mailbox Mailbox object or Mailbox ID
+	 * @return int
+	 */
+	public static function getID( $mailbox ) {
+		return is_object( $mailbox ) ? $mailbox->getMailboxID() : (int)$mailbox;
+	}
 }