I have a shared server with multiple user on it. I'm trying to secure their E-mail connection with a wild card certificate. I added the key in /etc/exim.key and the certificate bundle in /etc/exim.cert. Restarted Exim and dovecot. And on a secure@mailaccount.tld everything worked fine. But, there's always a but, the existing users have setup mail.domainname, through the non-secure ports(25/143/587).When I had setup this, users complained that Apple Mail was giving them certificate errors, en they could not click away. Which does not make sense, because when I openssl s_client -connect on domainname: 25/143/587, it shows a certificate not found error. On port 993/995/465 is showed the Wild card certificate.EDIT:Apple Mail users port 993 by default, which you can change during account creation. Only after...How can I enable Mail security through a certificate without hindering the existing non-secure Mail client configuration for my users?System informationCentOS Linux release 7.2.1511 (Core)DirectAdminExim 4.83
Mail security on a shared server
centos;certificates;exim