Securing majordomo

[leigh]

Hi, I have setup majordomo, but I only wish to allow certain people to access the lists, I have found that when I make an access file and put my email address only in it, that it is very easy to get access to the list and post to it by faking email and sending email to the lists as me.   Is there a more secure way to protect my lists?   I am running sendmail 8.9.3 and redhat 6.2   If I had to restrict the server which the mail was coming from to the local SMTP server (on the same machine) it would be ok   Thanks in advance for any help.....   Leigh