my question is simple : how to reemove a let’s encrypt certificate ? Because i have some problems and i want to restart from zero. Hope you can help me, thank you 
If using certbot, you can run the following:
$ sudo certbot delete
And you will be prompted into something like this
Which certificate would you like to delete?
-------------------------------------------------------------------------------
1: www.example.com
2: example.com
3: www.example.org
4: example.org
5: other.domain.com
-------------------------------------------------------------------------------
Select the appropriate number [1-5] then [enter] (press 'c' to cancel):Do I need to revoke the certificate first to prevent mails from the Let’s Encrypt Expiry Bot?
revocation does not stop the expiry emails
Andrei
Thank you. This means that there is no way to prevent these mails after deleting or revoking a certificate?
You can unsubscribe from them, but this is not recommended, because that unsubscribes your email from all expiration notification emails ever with no way to ever re-subscribe. So, you can, but you probably don’t want to. Once the certificate(s) expire, you won’t hear any more about them anyway. Not really a big deal.
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