[Nicolaj Ottsen <notjantik.dk>]
> I know it is here somewhere but I can't find it.
>
> I want to be able to "reroute" one domain to another, so that domainA.com
> becomes domainB.com.
>
> Could someone please give en example I can't seem to figure it out.

Use virtual or canonical. The difference between the two is that if use
canonical, mail sent to userdomiana.com wil be delivered to
userdomainb.com and will appear to originally posted to userdomainb.com.
Using, virtual, the mail will be delivered to userdomainb.com but will
apear to be originally posted to userdomaina.com

USING CANONICAL

If you want mail to domaina.com to actually be re-written to
doimanb.com, use canonical:

        (from the canonical man page)
      The format of the canonical table is as follows, mappings
       being tried in the order as listed in this manual page:

       blanks and comments
              Blank lines are ignored, as are lines beginning
              with `#'.

       userdomain address
              userdomain is replaced by address. This form has
              the highest precedence.

              This form useful to clean up addresses produced by
              legacy mail systems. It can also be used to pro­
              duce Firstname.Lastname style addresses, but see
              below for a simpler solution.

       user address
              usersite is replaced by address when site is equal
              to $myorigin, when site is listed in $mydestina­
              tion, or when it is listed in $inet_interfaces.

              This form is useful for replacing login names by
              Firstname.Lastname.

       domain address
              Every address in domain is replaced by address.
              This form has the lowest precedence.

       In all the above forms, when address has the form other­
       domain, the result is the same user in otherdomain.

So you would want canonical table that looks this:

# rewrite mail to userdomaina.com to userdomainb.com
domaina.com domainb.com

USING VIRTUAL

To just redirect the mail to domainb.com, use virtual:

        (from the virtual man page)

       The format of the virtual table is as follows, mappings
       being tried in the order as listed in this manual page:

       blanks and comments
              Blank lines are ignored, as are lines beginning
              with `#'.

       userdomain address, address, ...
              Mail for userdomain is redirected to address.
              This form has the highest precedence.

       user address, address, ...
              Mail for usersite is redirected to address when
              site is equal to $myorigin, when site is listed in
              $mydestination, or when it is listed in
              $inet_interfaces.

              This functionality overlaps with functionality of
              the local alias(5) database. The difference is that
              virtual mapping can be applied to non-local
              addresses.

       domain address, address, ...
              Mail for any user in domain is redirected to
              address. This form has the lowest precedence.

       In all the above forms, when address has the form other­
       domain, the result is the same user in otherdomain. This
       works for the first address in the expansion only.

So you would want a virtual table that looks like this:

# Set the domain as virtual (the second value on that first line
# can literally be anything
domaina.com somethingsomething
# redirect mail from domaina to domainb
domaina.com domainb.com

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