What are the general recommendations for a public-facing mail server regarding hostname? I've been living forever with mybox.domain.com, recently changed it to just domain.com and it broke Postfix delivery. While I'm sure I can work around that particular issue, I wonder what I can and should use in rc.conf for hostname, if my mails are delivered from address@domain.com, is there a point in having mybox there?
This is obviously tied to the PTR record which I'm also not sure about. I'm hosting multiple domains, they all have the same MX record, should it be mybox.domain.com or domain.com? I don't think it should matter if my PTR resolves to mybox.domain.com while MX is set to domain.com?
I'd probably keep mybox.domain.com in rc.conf but my SSL certificate only covers www.domain.com and domain.com, I have set those certs in smtpd_tls_chain_files in Postfix's main.cf, but not sure if those were even necessary for proper TLS delivery.
So TLDR: confusion between what should be put in hostname, MX and PTR.
This is obviously tied to the PTR record which I'm also not sure about. I'm hosting multiple domains, they all have the same MX record, should it be mybox.domain.com or domain.com? I don't think it should matter if my PTR resolves to mybox.domain.com while MX is set to domain.com?
I'd probably keep mybox.domain.com in rc.conf but my SSL certificate only covers www.domain.com and domain.com, I have set those certs in smtpd_tls_chain_files in Postfix's main.cf, but not sure if those were even necessary for proper TLS delivery.
So TLDR: confusion between what should be put in hostname, MX and PTR.
