When sending mail to your server, the following error is produced:
SSL verify error: certificate name mismatch
Mail is not delivered or is extremely delayed in delivery.
More specifically, the error follows this format:
[server-ip] SSL verify error: certificate name mismatch: DN="/CN=server.hostname.com" H="mail.user-domain.com"
This error is typically due to one of the following:
- AutoSSL failed to run
- AutoSSL has not yet been run for your domain
- The domain is not registered to a cPanel account your server but does have DNS directed there
- A third-party-issued certificate has expired
Please ensure that AutoSSL has successfully run for the domain in question.