How to change email address for the certificate expiration notice

How to change the email address that can receive certificate expiration notice.
And I have open the link on the buttom of email: "If you are receiving this email in error, unsubscribe at:
http://delivery.letsencrypt.org/track/unsub.php?u=.....",than display "won't send email to this address".
Now,Can I recover receiving emails and change email addresses?

thanks

If you use certbot, then you're looking for the update_account command, like in the bottom of the Expiration Emails documentation page.

If you're using some other client, you'd need to give more details on what you're using.

My device is Synology NAS.Certificates used by DSM web.
thanks.
How to do?

I don't have any personal knowledge of Synology, but hopefully there would be an option somewhere in it to tell it to send the account update request with a new email address. Maybe you'd have better luck on a Synology forum? Or maybe there's someone else here who knows more details.