Case :
I rent a hosting to host all mail to companyname.com.
There are 2 locations that will download the emails to local mail
server @ each location (using fetchmail) (because @ my location, we
don't have dedicated connections and internet is still expensive here).
Sending out email is using smtp relay to ISP's mail server.

To save bandwidth, I want to sort the outgoing mail so that email for
local users will be deliver directly, while user with the same domain
that is not local will go out thru smtp.

For example.
Office 1 : john@companyname.com, jane@companyname.com
Office 2 : smith@companyname.com

when john email to jane@companyname.com, I want it to be delivered
directly to jane local mail box.
If john email smith, then it will goes out thru internet.

I've trying to set the virtuser but it doesn't seem to work. If I use
mailertable, I don't think I can specify each user, but the whole
domain (cmiww). I tried to use procmail, but it seems that it only
filter the incoming mail.

I'm quite new with sendmail, and 0 knowledge on procmail. I've been
searcing the net for a few days, but I haven't found what I want.

Please spare me some tips. I'll really appreciate them.

TIA

regards,
Indramin