[Techtalk] postfix

[Wolf Rising]

I am trying to set up a postfix server, I have two other machines on the
domain.

I would like if someone sends mail to user at machine1.domain.com or
user at machine2.domain.com that it be delivered
the as if the email had just been sent to user at domain.com.

Is that possible to do? Or should mail only resolve to domain.com? If I send
email to user at mail.domain.com
that gets delivered.

Thanks!