If you change the DNS servers or the ip address of the site in the DNS editor, an error occurs when you renew the free SSL certificate issued earlier in the control panel.
The reason is that when you released it, the site was hosted in the control panel and referred to the ip address of the hosting. When the DNS servers of the site change, it begins to refer to other servers, and in this regard, notifications are received about the impossibility of renewing a previously issued certificate.
In order to disable these notifications, you need to remove the certificate by which they come in the control panel.
On the menu Websites and domains -> SSL/TLS Certificates -> Unassign certificate.
After making sure that the domain does not refer to the DNS or IP address of the hosting SYNAY - remove the SSL certificate, since it is no longer tied to the site anyway, and therefore cannot update itself.
After deletion, notifications from the control panel will no longer come to your mail.
Note: Since you specified an email when issuing the ssl certificate, it can also receive letters from the Let's Encrypt service itself, in this case we do not send these letters, and to disable notifications, follow the link at the end of the letter.