November 17, 2019 5:19 PM, "Implausibility" <open...@hottub.ca> wrote:
> I'm reading the man pages for makemap, and there are two types of database
> maps described, as per
> $subject.
>
> What are the functional / operational differences between Primary & Virtual
> Domains? When when I
> choose one over the other? Can I get examples of when I'd choose a table of
> primary domains, and
> when I'd choose a table of virtual domains?
>
> Which one should I choose if I want to send *and* receive mail from domains
> that are not the same
> as my mail server's name? (e.g... my business has many websites...
> example.com, example.us,
> example.io - and I'd like to send and receive mail for each of them
> separately... say, to route the
> eMail to the sales rep for a specific territory)
>
> Thanks.
I'll try to summarise it as simple as possible:
During the SMTP transaction, an e-mail address is provided for the recipient:
u...@domain.org
With a primary domain, OpenSMTPD assumes that domain.org == the local machine.
It will look for a system account matching the user and if one is found, then
mail is delivered.
The aliases mechanism is optional, if an alias exists a transform happens,
otherwise the username is looked up as is.
With a virtual domain, OpenSMTPD assumes that domain.org == the content of the
virtual table.
The virtual mechanism is not optional, the recipient MUST exist in the table to
be valid.
If you use a primary domain, when you create a new system user you can mail
them right away.
If you use a virtual domain, you'll have to declare that user in the table.
