Mailcow allows to set many domains on a server, but 1 IP can only give 1 PTR record. I gave PTR record to one of my domains. Today, I bought SSL certificate for all of my domains and give the email of admin@domains, but only the domain which has PTR record get the confirm email from globalsign. Other normal email can be sent or received correctly, only cannot receive SSL confirm email. Is there any way to deal with this problem?
BTW, I want to know what is the path of the nginx and mailcow panel website, I didn't find them.