I have a slave mail server in a multi-server setup and wanted to mirror (cluster) it for redundancy. Going thru the docs about setting about replication for MySQL and mail server using dovecot a thought occurred to me. When my users set up a mail client the have a incoming and outgoing mail server set using SSL cert on my mail server (lets say mymail.acme.com) If I set up a mail cluster there are 2 IP's now. If I setup an A record for both IP's, which mail server name do my customers put into their mail client? Do I setup a ssl cert with the same name on both servers? A mymail.acme.com 192.168.0.105 A mymail.acme.com 192.168.0.106 Will my customers use mymail.acme.com for incoming and outgoing server and will letsencrypt allow me to have certs on both servers for the same name mymail.acme.com? First attempt at clustering so not sure if I'm missing something or not. Thanks!