I have multiple domains utilizing one single server for all email. I've
read multiple documents and got everything setup and working, I think,
correctly.
My postfix handles all the domains correctly.
My dovecot handles all the users correctly.
My roundcube handles the multiple accounts correctly.
What I'm curious about is my dmarc/dkim setup and my DNS setup.
My primary domain looks like
A domain.com xxx.xxx.xxx.xxx
MX domain.com mail handled by domain.com
TXT mail._domainkey.domain.com blahblahblahblah
TXT _dmarc.domain.com blahblahblahblah
SRV _submission._tcp.domain.com directs to domain.com
Each additional domain is setup identically, with their own dmarc and
dkim, except the mx points back to domain.com
so domain.net would look like
A domain.net xxx.xxx.xxx.xxx
MX domain.com mail handled by domain.com
TXT mail._domainkey.domain.net diffblahblahblahblah
TXT _dmarc.domain.net diffblahblahblahblah
SRV _submission._tcp.domain.net directs to domain.net
My question is, do I not need to do any of this for the domains that are
not actually handling the email, but only for domain.com which actually
accepts and sends email?
Thanks!
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