I am currently running an Exchange 2013 server (15.0 1178.4) with multiple accepted domains and the issue is that i have one SSL certificate installed which is valid but there is only the primary domain with the autodiscover and mail names listed in it.
Therefore I experience Outlook SSL warnings that the
autodiscover.domain.tld is not listed in the certificate.
I have already tried multiple things as like using the SRV DNS Record method which looks like that:
_autodiscover._tcp 300 SRV 10 0 443 ex13.primary-domain.tld. _autodiscover._tcp 300 SRV 0 5 443 ex13.primary-domain.tld. autodiscover.domain.tld CNAME ex13.primary-domain.tld.
Those records make it possible for Outlook to determine all of the settings but after setting an account up and having it running for a few minutes there is a popup which shows the SSL warning as stated above.
Since I have about 30 domains running on it and I don't really want to get a SAN/MultiDomain Certificate I'd like to know if there is a other solution for that.
Would the Lets Encrypt SAN feature maybe work for such a setup?