Why is mail not sent from the domain?

Question

Mail server

Everything was OK, but there was such a problem:

This is the mail system at host gifted-dhawan.165-22-204-9.plesk.page.

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

: host gmail-smtp-in.l.google.com[142.250.153.27]
said: 550-5.7.1 [165.22.204.9 19] Our system has detected that this
message is 550-5.7.1 likely suspicious due to the very low reputation of
the sending 550-5.7.1 domain. To best protect our users from spam, the
message has been 550-5.7.1 blocked. Please visit 550 5.7.1
https://support.google.com/mail/answer/188131 for more information.
kx3si11233489ejc.504 - gsmtp (in reply to end of DATA command)
Reporting-MTA: dns; gifted-dhawan.165-22-204-9.plesk.page
X-Postfix-Queue-ID: 3D3447E0CE
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Mon, 20 Dec 2021 12:38:12 +0000 (UTC)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.1
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 [165.22.204.9 19] Our system has detected
that this message is 550-5.7.1 likely suspicious due to the very low
reputation of the sending 550-5.7.1 domain. To best protect our users from
spam, the message has been 550-5.7.1 blocked. Please visit 550 5.7.1
https://support.google.com/mail/answer/188131 for more information.
kx3si11233489ejc.504 - gsmtp

Answer 1

https://support.google.com/mail/answer/188131
check IP by blacklists

Answer 2

Most likely, your letters sent to Google mail received too many spam clicks. Connect google postmaster, check domain reputation