Suite Erreur SMTP 550 5.1.1 : Recipient address rejected : User unknown in virtual mailbox table

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J’ai essayé, déjà une amélioration, le message est envoyé. par contre j’ai cette erreur Undelivered Mail Returned to Sender

This is the mail system at host relay14.mail.gandi.net.

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

equipe@domaineA.fr: host domaineA.fr[XXX.XX.XX.XX] said: 553 5.7.1
user@domaineA.fr: Sender address rejected: not logged in (in reply
to RCPT TO command)

Reporting-MTA: dns; relay14.mail.gandi.net
X-Postfix-Queue-ID: 976F91A0003
X-Postfix-Sender: rfc822; user@domaineA.fr
Arrival-Date: Sun, 16 Oct 2022 11:59:50 +0000 (UTC)

Final-Recipient: rfc822; equipe@domaineA.fr
Original-Recipient: rfc822;equipe@domaineA.fr
Action: failed
Status: 5.7.1
Remote-MTA: dns; domaineA.fr
Diagnostic-Code: smtp; 553 5.7.1 user@domaineA.fr: Sender address
rejected: not logged in