Question : how to configure sendmail for mail server host in virtual domain lan

In the past I have configured a dedicated linux host to act as a mail server in a LAN configuration. Now, I need to do something similar (dedicate mail host), but I have several hosts in the lan each hosting several virtual domains. I want the mail server to route incoming mail to the appropriate host. I can easily configure Network Solutions to send the various domain's email to this one host. I'm sure this is a pretty typical configuration for ISP setups, but it's new to me. I need lots of help!

In the code snippet below is a sendmail.mc file (sans-comments) I've used as a templae in the past. Perhaps this is a good starting point.

What do I need to do to make this work on my mail server given the configuration I've spacified.

Code Snippet:

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include(`../m4/cf.m4') OSTYPE(`linux')dnl define(`confTO_IDENT', `0')dnl define(`confBAD_RCPT_THROTTLE',`1')dnl define(`confCONNECTION_RATE_THROTTLE',`3')dnl define(`confDEAD_LETTER_DROP',`/dev/null')dnl define(`confDOUBLE_BOUNCE_ADDRESS',`nobody')dnl define(`confDF_BUFFER_SIZE',`16384')dnl define(`confXF_BUFFER_SIZE',`16384')dnl FEATURE(`use_cw_file')dnl FEATURE(`use_ct_file')dnl FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl FEATURE(`access_db', `hash -T /etc/mail/access')dnl FEATURE(`lookupdotdomain')dnl FEATURE(`blacklist_recipients')dnl FEATURE(`dnsbl')dnl FEATURE(`dnsbl', `relays.ordb.org')dnl FEATURE(`dnsbl', `dul.dnsbl.sorbs.net')dnl FEATURE(`delay_checks',`friend',`n')dnl FEATURE(`local_procmail',`',`procmail -t -Y -a $h -d $u')dnl FEATURE(`always_add_domain')dnl FEATURE(`redirect')dnl MASQUERADE_AS(`novatec-inc.com') FEATURE(`masquerade_envelope') FEATURE(`masquerade_entire_domain') dnl# FEATURE(`relay_entire_domain')dnl EXPOSED_USER(`root')dnl dnl# Also accept mail for localhost.localdomain: LOCAL_DOMAIN(`localhost.localdomain')dnl MAILER(local)dnl MAILER(smtp)dnl MAILER(procmail)dnl

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Answer : how to configure sendmail for mail server host in virtual domain lan

And add in /etc/mail/access for mail.fluxrunner.com:

To:courtscan.com       RELAY

Once the MX record for this domain is visible via a dig, mail to this domain should work.