I use the plugin Let's Encrypt for customers SSL Cert.
I want to offer mail with SSL connection for every customer which have activated the Let's Encrypt Cert. Normaly every domain have a subdomain (i.e. mail.example.com) for mx configured.
So if I setup such a mail account on my local mail client, I get a certification error, which say that the connection maybe is insecure.
For IMAP and SMTP server we would like to use mail.example.com and not the host.
I'm not sure how to do that. I've tried to create a domain alias & subdomain with a certificate but nothing works.
Is it possible do it like I want, or did I have to use the host name ?
Debian GNU/Linux 9.3 (stretch)
i-MSCP 1.5.1, Codename: Ennio Morricone
Mail client: Different (Thunderbird, iPhone Mail Client, etc.)
Let's Encrypt 3.3.0