configuring sendmail
 

I am trying to configure sendmail on RedHat 6.2 to handle e-mails for multiple domains. I've modified files in /etc/mail/:
access:
domain.com RELAY

virtusertable lines simillar to:
user1@domain.com localuser1
@domain.com someone.else@otherdomain.com
(for some users I have local accounts, for others I just want e-mail forwarded to another mailbox)

to local-host-name:
domain.com

I did "make all" and "sendmail restart". I've installed imap and enabled ipop in inetd.conf and restarted inetd.

Now e-mail sent to user1@domain.com does get stores in localuser1's mailbox and I can retrieve it via pop3, I can send e-mail from from user1@domain.com to user2@anotherdomain.com (also hosted on my server) but I can not send mail to billg@microsoft.com (well maybe that's a good thing, but I should be able to...) What am I missing? What do I need to configure to not only be able to pop3 messages from localuser1's account, but also send e-mails as user1@domain.com?
Artur

related question
 

Another question for that same machine running RH6.2: my linuxconf is acting up, so I don't want to use it. Last time I tried using it, it wiped out my DNS config. I know that it is possible to set up virtual mail hosting with vpop3d through linuxconf, but it requires unique IP for each virtual domain. I don't have this many IPs. How can I configure vpop3d manually (without linuxconf) and set it up to share the same IP for all domains?

My goal is to add virtual mailboxes without adding users to the system, be able to create catch-all mailboxes for e-mails sent to non-existing accounts within domain and for owners of virtual mail boxes to be able to send and receive e-mail.

Any better programs out there that will do this?

Artur