mail.merekmu.co.id has an A (IPv4) record (202.46.123.149) 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.
A timeout was experienced while communicating with mail.merekmu.co.id/202.46.123.149: Get "http://mail.merekmu.co.id/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://mail.merekmu.co.id/.well-known/acme-challenge/letsdebug-test (using initial IP 202.46.123.149)
@0ms: Dialing 202.46.123.149
@10000ms: Experienced error: context deadline exceeded
A test authorization for mail.merekmu.co.id to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
202.46.123.149: Fetching http://mail.merekmu.co.id/.well-known/acme-challenge/YQzgN57EbTXGB_-88gl4oQFWA25kf5yQXE6FH675fn4: Timeout during connect (likely firewall problem)