Undelivered Mail Returned to Sender

This is the mail system at host smtp-4-3000.mail.infomaniak.ch.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please consult our FAQ.
https://faq.infomaniak.com/858

The mail system

———————————————————————-

C’est le système de messagerie de l’hôte smtp-4-3000.mail.infomaniak.ch.

Je suis désolé de devoir vous informer que votre message n’a pas pu
être remis à un ou plusieurs destinataires. Il est attaché ci-dessous.

Pour plus d’assistance, veuillez consulter notre FAQ.
https://faq.infomaniak.com/858

Le système de messagerie

: host msn-com.olc.protection.outlook.com[52.101.194.2]
said: 550 5.5.0 Requested action not taken: mailbox unavailable
(S2017062302). [CH1PEPF0000A347.namprd04.prod.outlook.com
2026-03-12T22:17:12.831Z 08DE79C02AE2E6F5] (in reply to RCPT TO command)