Mail subdomain SSL certificate mismatch [SOLVED]

[Eoler]

Ciao,
enjoying this great piece of management software for migrating PHP-served domain configurations,
but having problems with e-mail serving setup - external clients throw SSL mismatch errors on POP3
connections to mail.<domain.tld> server endpoint. There are many already configured e-mail clients
out there so I'm searching for a workaround to preserve existing configuration without the need to
contact my users (hopeful because of "If available, you can use, your own SSL/TLS protected domain
as well" comment in Email Addresses/Connection Data info popup).

[Martin]

Hello,

you would need a manual generated SAN certificate to cover mail.domain.tld here. Let's Encrypt certificate for maildaemon is for the servers hostname.

[Eoler]

you would need a manual generated SAN certificate to cover mail.domain.tld here. Let's Encrypt certificate for maildaemon is for the servers hostname.

So no autorenewing after certificate expiry? That's not ideal.
How about creating mail.domain.tld as subdomain, would that make it's LE certificate usable for mailing?

[Martin]

Hello,

Let's Encrypt certificate for Postfix/Dovecot is currently only supported for hostname of the server itself.