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Hello:
In SECURITY -> SSL/TLS Certificates -> Secure server services, you can use letsencrypt for the control panel server, email server, and ftp server, but the names are panel.<domain name>. May I ask you, like attachments, mail server and ftp server have an exclusive name? In addition, what does webmail subdomain mean?

Currently not, but one of the next updates will very likely offer SNI support for the mail server.

In addition, what does webmail subdomain mean?

webmail.<DOMAIN-NAME>

The one you configure here: Configuration -> Tools -> Webmail

OK,I changed it.
Could webmail use letsencrypt?In this time.It's use default.So if I set webmail address is https://webmail.<domain.name> and keep domain name.Then I open https://webmail.<domain.name> via browsers.It's will show secure warning.

No it cannot use Let's Encrypt. Thats why "Redirect" is the default option in "Configuration" -> "Webmail".