mail.21jerry.com has an A (IPv4) record (50.211.214.194) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
Get "http://mail.21jerry.com/.well-known/acme-challenge/letsdebug-test": dial tcp 50.211.214.194:80: connect: connection refused
Trace:
@0ms: Making a request to http://mail.21jerry.com/.well-known/acme-challenge/letsdebug-test (using initial IP 50.211.214.194)
@0ms: Dialing 50.211.214.194
@83ms: Experienced error: dial tcp 50.211.214.194:80: connect: connection refused
A test authorization for mail.21jerry.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
50.211.214.194: Fetching http://mail.21jerry.com/.well-known/acme-challenge/_t1B1WipOfv5k2-waPqCvEQ84artJqs4ZZNSmUu_sh4: Connection refused