03-12-2014
Isn't it a security violation to use user authentication on the system mail server? It sounds like advanced sendmail setup. Do you have established id/pw store, or just want to set one up? Something like ldap would work nice for the later case.
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forward(4) Kernel Interfaces Manual forward(4)
NAME
forward - forward mail
SYNOPSIS
/var/adm/forward/username $HOME/.forward
DESCRIPTION
The .forward file allows a user to forward messages to another host, or to invoke programs (such as vacation(1)) to process their mail. It
is formatted as a series of comma-separated addresses in the form: addr_1, addr_2, ... Alternatively, each address can be on a separate
line.
The newer sendmail.v8 program also allows the use of comments (lines that begin with a ``#'') and blank lines.
As with the aliases(4) file, mail messages can be forwarded to another host or given to programs for further processing. The following is
an example of the vacation program. Assuming that the user's name is myra, create a .forward file and add the following line: myra,
"|/usr/bin/vacation myra"
The previous example forwards mail to myra (the backslash prevents an accidental aliasing loop), and also sends a copy of the message to
the vacation program.
For security reasons, the file must be owned by the user or by root and it should be writable only by the file owner. In addition, the
file must be readable by the owner (myra) or root.
On traditional systems, only the $HOME/.forward file is checked. The sendmail.v8 program allows the use of the system-wide forwarding
directory /var/adm/forward. By default, this directory is checked for a forward file prior to examining the users $HOME directory.
FILES
System-wide forwarding file. The per-user forwarding file.
RESTRICTIONS
The sendmail command can hang trying to read the user's $HOME/.forward file. If the user's home directory is NFS-mounted and temporarily
unavailable, sendmail will stall until the directory becomes available again. The use of non-NFS mounted directories for the forwarding of
files is recommended.
The use of /var/adm/forward is supported only by sendmail.v8.
The actual path for /var/adm/forward is configurable in the sendmail.cf file.
Incorrect file permissions/ownership are quietly ignored.
It is easy to create an accidental loop, for example, on host_a myra@host_b and on host_b myra@host_a
RELATED INFORMATION
Commands: aliases(4), sendmail.cf(4), sendmail(8) delim off
forward(4)