sendmail config for branches

[lutzmh]

Hi, I'm looking for a sendmail config to receive local mails (this works perfect at the moment) and to send non-local emails to a webserver. e.g All of us are in the domain domain.com with branches in Rio, Tokyo and London. The users A,B and C @domain.com are working in Rio, users D,E, and F in Tokyo and G,H, I in London. The User G is not a local user in Rio and i get the message "the mailbox doesn't exist". All branches are working with a flaterate internet access and fetchmail to catch the mails from our Internet provider. Tx