The only advice that I can give you is to scrap sendmail completely & go with qmail. Sendmail is very difficult to configure & is full of security holes. I have taken the following from a qmail tutorial site called Life with qmail (
http://www.lifewithqmail.org )
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qmail was designed for high security. Sendmail has a long history of serious security problems. When Sendmail was written, the Net was a much friendlier place. Everyone knew everyone else, and there was little need to design and code for high security. Today's Internet is a much more hostile environment for network servers. Sendmail's author, Eric Allman, has done a good job of tightening up the program, but nothing short of a redesign can achieve true security.
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Qmail, on the other hand is quite easy to configure & there has never been so much as a single report of someone finding any sort of security flaw.
I did quite a lot of research about a year ago looking for a good MTA that is easy to install, configure & maintain but is also secure, & qmail won hands down. There are many, many tutorial sites out there to help you learn qmail, & I checked out most of them, but the one I settled on was
www.qmailrocks.org This site was extremely simple to follow & absolutely invaluable.
If you have the choice, remove sendmail immediately & fire up qmail, you'll not regret it.
Good luck & let me know what you decide.
Need help on sendmail
