Email DNS setups for multiple domains using a single domain mail server

[Stephen Partington]

If you are the authoritative record for the domain you need to specify
where that email goes. If you have a DNS provider that you are using to
manage that DNS traffic then they likely have some of this automated.

On Wed, Sep 4, 2019 at 5:39 PM Nathan <plugaz at codezilla.xyz> wrote:

>
> 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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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen
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