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How do I forward a Microsoft 365 (business) mailbox to ArkiaMail?

In a company, Microsoft 365 often blocks forwarding to an outside address: you then need the administrator’s approval.

Step by step

  1. Open Outlook on the web, in a web browser, with your work account.

  2. At the top of the window, click Paramètres (Settings), then open Courrier (Mail) and Transfert (Forwarding).

  3. Turn on Activer le transfert (Enable forwarding) and type your ArkiaMail address. Check Conserver une copie des messages transférés (Keep a copy of forwarded messages) to keep a copy, then click Enregistrer (Save).

  4. Test it: from another address (a relative’s, for example), send an email to your old address. It should arrive in your ArkiaMail mailbox, in ArkiaSuite. If it bounces back with an error containing « 5.7.520 », your company blocks forwarding to the outside.

Good to know

  • Since 2021, Microsoft has blocked forwarding to the outside by default in new organizations.
  • The administrator can also forward the mailbox themselves, from the Microsoft 365 admin center.
  • A whole company changing its email system (domain name, all mailboxes)? That needs preparation. Write to us with Signaler un problème (Report a problem).
  • Your old Microsoft 365 e-mails: GS Informatique does this migration with you, on 09 51 56 59 54 or at contact@arkiasuite.fr.

See also

Source (in French): Activer ou désactiver le transfert automatique dans Outlook ; Contrôlez le transfert d’e-mails externe et corrigez les erreurs 5.7.520. Read on October 22, 2026. If the menus have changed, the provider’s own help is right.