Undelivered Mail Returned to Sender

This is the mail system at host smtp-3-3000.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 send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
<dan.j.m@hotmail.fr>: host eur.olc.protection.outlook.com[104.47.14.33] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). (in reply to RCPT TO command)
<alray@free.fr>: host mx1.free.fr[212.27.48.6] said: 550 5.2.1 This mailbox has been blocked due to inactivity (UserSearch) (in reply to RCPT TO command)
<francois.vandorpe@free.fr>: host mx1.free.fr[212.27.48.7] said: 550 5.1.1 user unknown (UserSearch) (in reply to RCPT TO command)
<pierrefoot89@hotmail.fr>: host eur.olc.protection.outlook.com[104.47.13.33] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). (in reply to RCPT TO command)
<david.59@live.fr>: host eur.olc.protection.outlook.com[104.47.13.33] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). (in reply to RCPT TO command)
<claude.fantin@hotmail.fr>: host eur.olc.protection.outlook.com[104.47.13.33] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). (in reply to RCPT TO command)
<dys_rpt_gsc@hotmail.fr>: host eur.olc.protection.outlook.com[104.47.13.33] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). (in reply to RCPT TO command)
<jean-marie.fecherolles@orange.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.1.1 gnkGpupbg5wk3 Adresse d au moins un destinataire invalide. Invalid recipient. OFR_416 [416] (in reply to RCPT TO command)
<clarissedp@orange.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.2.0 gnkGpHZaJxvKM Mail rejete. Mail rejected. OFR_506 [506] (in reply to end of DATA command)
<amandine.dutertre@heppner.fr>: host mxa-00391b01.gslb.pphosted.com[185.132.181.225] said: 550 5.1.1 User Unknown (in reply to RCPT TO command)