Multiple Domains with macOS Server Mail

[Prodo123]

Hi,

I'm trying to host email services for multiple domains (foo.com and bar.com). They are two separate sites using two separate CA certificates specific to each domain.

Now, when I set up the mail service, the service only allows the use of one certificate to secure the service across multiple domains, resulting in a mail server certificate conflict. I want to avoid this as much as possible without using a certificate that covers both domains. Is there a way to achieve this?

 

[Geeky Chimp]

This can be achieved by manually editing the Postfix config files to map a specific hostname and certificate to an IP. Your mail server would need 2 IPs - one per domain to do this. For IMAP/POP you’d need to make similar edits to the Dovecot config files. I did this several years ago and it worked well, but we have since transitioned to free UCC certs from LetsEncrypt.