Gerardo Gregory writes:
Been tasked with setting up a virtualdomain that is private for internal
corporate communication.
Currently I have Courier-MTA, maildrop for local delivery, PAM auth, and
some virtul domains already setup using userdb.
The domain I am asked to setup needs to only be able to send / receive
mail from within that domain. How do I create this type of restrictions?
A âdomainâ cannot send/receive mail from within that domain no more than a
last name can talk to another last name.
A âdomainâ is conceptually the same as a person's last name. Last names do
not talk to each other. People with last names talk to other people.
Similarly, domains don't send messages; it's mail clients who send messages.
Any mail client can be configured to use any E-mail address, and any domain
that the user wishes to use.
You can no more restrict a âdomainâ from sending mail than restricting a
last name from talking to each other.
There's nothing a mail server can do to physically prevent a given mail
client from using any return address. The theoretically closest that comes
to that is requiring all mail clients to use authentication, and restricting
the From: header to match the authenticated sender's identity; but that in
no way stops the mail client from being configured to use a different mail
server.
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