Red Hat Sendmail FAQ
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3.9 I have users on my local LAN who need to use my box as their MTA. When they send mail from their client software it bounces. How do I fix this?

In /etc/mail/access add the IP addresses for all of the client machines with the word RELAY just like we did in question 3.8 above. Then issue the command makemap hash /etc/mail/access.db < /etc/mail/access, restart sendmail and try your tests again.

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3.8 I need to act as a secondary MX for a friend of mine's domain, but inbound mail for that domain gets rejected. How do I make this work?Up3.10 Sendmail seems to be working fine, but when my users try to connect to the mailhost to POP their mail, they can't connect. What's wrong?