Note that most of the users here, myself included, are just volunteers of this Community and not related to Let's Encrypt in any way, besides being users of it like yourself. I'm just re-iterating statements made earlier in combination with my views/interpretation of the situation.
That migh be the case indeed. As in, sounds likely to me, without exactly knowing the migitation deployed by Let's Encrypt.
And yes, that's very annoying and I can understand your issue with such a broad mitigation. However, I'm fairly certain that if Let's Encrypt had a better way of mitigating this cPanel (#)$)(#$(#), they would have. I'm not sure if "the good suffer for the bad" is a proverb in English, but this seems to be a class book example of it.
So to summerise: in effect, a buggy cPanel is DDoS-ing the Let's Encrypt ACME API, mandating mitigating actions which unfortunately affect all users with the same user agent. As Let's Encrypt just has the user agent to work with, it cannot distinguish cPanel users from non-cPanel users.
There is still a foot problem and the following error
WARN AutoSSL failed to create a new certificate order because the server’s Let’s Encrypt account (https://acme-v02.api.letsencrypt.org/acme/acct/208383230) has reached a rate limit. (429 urn: ietf: params: acme: error: rateLimited (The request exceeds a rate limit) (Error creating new order :: too many certificates (5) already issued for this exact set of domains in the last 168 hours: mail. mydomain.com, www.mydomain.com: see Rate Limits - Let's Encrypt)) You may contact Let's Encrypt to request a change to this rate limit.
ERROR “Let’s Encrypt ™” general error (www.mydomain.com): A rate limit prevents DCV.
ERROR “Let’s Encrypt ™” general error (mail.mydomain.com): A rate limit prevents DCV.
ERROR Impediment: TOTAL_DCV_FAILURE: Every domain failed DCV.
we have same issue
all of our hosting site over 2,000 site cert expired (Lets Encrypt)
i removed lets encrypt script and re-installed it and new letsencrypt version is installed.
but we have an error:
MASTER DCV: A rate limit prevents DCV.