Pkg exim4 users - Jul 2008 - unconditional forwarding for certain email addresses

Hi all,

I''m a newbie Exim4 admin so don''t flame me too hotly.... ;)

I have a working Exim4 install and it''s been giving me no problems but
I
have an issue I haven''t been able to work around.  We forward email for
several domains we host and local mail from the internal lan.  We do not
implement a pop3 server as per management decision.  

The issue I''m having is we are a distributed environment and we also
have employees that travel a lot.  Not all the remote employees have
static IP addresses so I can''t just configure exim4 to unconditionally
forward email from their IP addresses and that is impossible for road
warriors. This results in any email sent from their remote address being
bounced if it is not addressed to a domain for which we forward
mail.    

Could someone point me to how to configure exim4 to unconditionally
forward mail from certain email addresses just like it''s possible to do
with IP addresses or network blocks?  I''ve spent quite a bit of time
Googling this issue, have Philip Hazel''s book, and Debian''s
documentation but just can''t find anything that addresses this specific
issue.  Maybe it''s just because I''m not using the correct
search
terminology, but I''ve put quite a bit of time into this already and
have
drawn a blank so far.

Gary Koskenmaki escreveu:
> Could someone point me to how to configure exim4 to unconditionally
> forward mail from certain email addresses just like it''s possible
to do
> with IP addresses or network blocks?
Please don''t do that. It''s ridiculously easy to forge
"From" addresses,
and you''ll have a system open for spammers to use.

A viable solution would be to require your travelling users to 
authenticate themselves (using the mechanisms available in SMTP), and 
allow relaying from authenticated users. This is the default setup in 
Debian, you just need to set an authentication database. I believe there 
are some examples in the configuration file; the whole story is found in 
chapters 33 onwards in the Exim documentation[0].

[0] http://www.exim.org/exim-html-current/doc/html/spec_html/