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
<erisuger@numericable.fr>: host smtp-in.sfr.fr[93.17.128.165] said: 550 5.1.1 <erisuger@numericable.fr>: Recipient address rejected: User unknown (in reply to RCPT TO command)
<els.vaelen@telenet.be>: host mx2.telenet-ops.be[195.130.132.9] said: 550 5.1.1 Recipient address rejected: User Unknown (in reply to RCPT TO command)
<christelle.briand@neuf.fr>: host smtp-in.sfr.fr[93.17.128.165] said: 550 5.1.1 <christelle.briand@neuf.fr>: Recipient address rejected: User unknown (in reply to RCPT TO command)
<leila.moulla@laposte.net>: host smtpz4.laposte.net[160.92.124.66] said: 550 5.7.1 Service refuse. Veuillez essayer plus tard. service refused, please try later. LPN007_510 (in reply to end of DATA command)
<redclima@yahoo.fr>: host mx-eu.mail.am0.yahoodns.net[188.125.72.73] said: 552 1 Requested mail action aborted, mailbox not found (in reply to end of DATA command)
<ptikokin@yahoo.fr>: host mx-eu.mail.am0.yahoodns.net[188.125.72.74] said: 552 1 Requested mail action aborted, mailbox not found (in reply to end of DATA command)
<demoi.ahamed@hotmail.fr>: host eur.olc.protection.outlook.com[104.47.18.97] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). (in reply to RCPT TO command)
<albertchaudron@orange.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.2.0 gnmcpHtg98lvx Mail rejete. Mail rejected. OFR_506 [506] (in reply to end of DATA command)
<julien.bena@orange.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.2.0 gnmcpl4XTsock Mail rejete. Mail rejected. OFR_506 [506] (in reply to end of DATA command)
<noyelles.julien@orange.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.1.1 gnmcp9QLbRML4 Adresse d au moins un destinataire invalide. Invalid recipient. OFR_416 [416] (in reply to RCPT TO command)
<e.colmar@wanadoo.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.2.0 gnmcp9QLaRML4 Mail rejete. Mail rejected. OFR_506 [506] (in reply to end of DATA command)
<ophelia.bolmin@wanadoo.fr>: host smtp-in.orange.fr[80.12.26.32] said: 550 5.2.0 gnmcp9QLaRML4 Mail rejete. Mail rejected. OFR_506 [506] (in reply to end of DATA command)