I have been soliciting help from this list for some time now in the process of planning my new single-server, multi-domain web and mail server, with domains 'domain1.tld1' through 'domainN.tldN'.
I have been experimenting with Lets Encrypt clients with mixed success, and, as of this morning, think I have all the bugs worked out for all my domains. In the example use of the client it shows creating a single server cert for 'foo.com www.foo.com smtp.foo.com'. I don't pretend to know all the details yet, but I believe that I must have only one MTA on the server and that it must have a single name which is the same for the MX record for each of the multiple domains. My planned name is 'mail.domain1.tld1'. Now my question: is there any future benefit to having tls certs for a host name of "smtp.domain.tld" for each "domain.tld" when all domains will have the same mail server? Thanks. -Tom
