Let's Encrypt upgrade ACME v2 and Wildcard Certificate

[R.B]

Let's Encrypt Wildcard Certificate is very necessary for us to configure dns，Can I upgrade this feature? thank!

ps:(Server DNS diagnostics:Domain name aliases for services . You should have wildcard SSL certificate otherwise your clients will be forced to accept encryption warnings))

[SH]

You can easily add aliases for services at https://<mailserver>/admin/le/

LE's wildcards are nice feature but it is AFAIK limited to one issued certificate because DNS challenge requires to be only at defined DNS record _acme-challenge.domain - otherwise automatic renew will not work