I am trying to wrap my head around the proper way to do a let's encrypt for multiple domains in PostFix. It seems my current setup only has one cert for postfix. Every time I do a "copy to Postfix" it overwrites whatever was there last. This tends to generate messages for clients.
What is the proper way to fix this?
Say I have j2sw.com and startawisp.com. Both have different mail servers that need a cert. What is the proper way to have a cert for each? Hope this is clear enough.