address unknown on sendmail

I setup sendmail on my server and all user that have acces to server except for root get error mesage user unknown but it works fine for root and any pop user aslo I can send e-mail on internet.
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JBURGHARDTAsked:
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SiegerConnect With a Mentor Commented:
You cannot have upper case as user name in Linux....  it only knows usernames in lowercase... at least the first letter.... you can try to make a bogus user with all lower case and send mail to it.. I bet it will work....
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alexbikCommented:
Hi,

If I understand it, All users have POP3 access, but if you try to send mail to root it bounces? Check if there is an alias for root in /etc/aliases pointing to a non-existent user,
or maybe there's a screwed up .forward file in the homedir of root (usually this would be /root/.forward ? You may want to check the output of 'sendmail -bv root' to see if it works, so you don't have to send test e-mails all the time.

Alex
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JBURGHARDTAuthor Commented:
All only pop user have the  e-mail working but all local users with acces to server ( they can log on it using telnet ) can't get they e-mail they can send it out to root or to internet but when I try to send e-mail to any of user I get user unknown error
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JBURGHARDTAuthor Commented:
Adjusted points to 30
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marcelofrCommented:
what are you using to send/receive mail? when you´re logged, what´s the output of "echo $MAIL"? Does the file/directory it is pointing exists? what´s your distribution and mail transport agent (sendmail, qmail, smail, etc)?
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JBURGHARDTAuthor Commented:
I have redhat 5.1 and there is sendmail and I use it if use only pop user they are fine as root I can send e-mail to any of pop e-mail but usesrs with full acces to server can't recive e-mail in pine I can type name of user and I will get e-mail addres and full name but I will get e-mail back with error user unknown but send the e-mail to any pop users there is no problem. So I think that there is conf file with users names and it only is updated with pop users names so I will like get more info on it.
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SiegerCommented:
Has it been working before?  What are the usernames that you are adding?  are they all lower case?  just checking..
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JBURGHARDTAuthor Commented:
No it wasn't working is new installation, they are in uper and lower case. First later is in uper case the rest is in lower.
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JBURGHARDTAuthor Commented:
Yes it works with lower case if I need uper case I can always use aliases
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