I have setup a mialbox 0.40 on Ubuntu 18 successfully where primary subdomain works fine .
Im trying to add second domain and having troubles on autoconfigure/autodiscover with it. The second domain has WWW outside of mailinabox, plus DNSes are not hostes with MIAB.
Thus , firstly :
As domain main A record points to other server i have no chance of generating Letencrypt for second domain subdomains (such as mail.seconddomain.com, pop.seconddomain.com, imap.seconddomain.com , autodiscover , autoconfig). MIAB complains:
"No certificate installed. The domain name does not resolve to this machine "
Without these working - i cant setup autoconfigure/autodiscover
PS - this post was edited to make my question more detailed and clear.