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Old 05-31-2002, 05:58 PM   #1
LQ Newbie
Registered: May 2002
Distribution: Redhat 7.3
Posts: 2

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Question Sendmail unable to find users?


I was wondering if any of the linux/sendmail gurus out there could help me figure out this problem.

I decided to set up linux on a spare computer I have lying around. I am trying to set it up as a mail/web server, but have run into some basic configuration problems mostly related to sendmail (at least I think).

Anyways, the problem is this:

Lets say I have these three users:
1. root (standard)
2. FLast (Firstname Lastname --> FLast)
3. test (created for testing)

FLast and test can send mail to root. root receives this mail.

root can send mail to test. test receives this mail.
root cannot send mail to FLast. Sendmail returns an error.

at a shell prompt, this is what is returned using sendmail -bv:
> sendmail -bv test
test... deliverable: mailer local, user test
> sendmail -bv FLast
FLast... User unknown
> sendmail -bv root
root... deliverable: mailer local, user root

Does anyone have any idea why mail would be deliverable to test but not FLast? Is this an issue with having caps in the user name?

Both these users were configured in the exact same manner using the exact same settings.

System Specifics
Distribution: Redhat 7.3
Sendmail Version: 8.11.6-15 (included and configured by Redhat)

If needed, I can post my file.

Any help would be very greatly appreciated, thanks!
Old 06-01-2002, 01:32 PM   #2
Registered: Aug 2000
Location: NY - USA
Distribution: Slackware
Posts: 109

Rep: Reputation: 15
Sendmail, by default, will convert upper-case usernames to lower-case prior to delivery, in order to allow "case-insensitivity" in email addresses.

If you wish to keep your upper-case usernames, you will need to change the Mlocal line in your Here's an example. Change:

Mlocal, P=/usr/bin/procmail, F=lsDFMAw5.....


Mlocal, P=/usr/bin/procmail, F=lsDFMAw5u...

The addition of the lowercase "u" option tells sendmail to preserver upper-case usernames when attempting local delivery. Or, you could just use lower-case usernames
Old 06-01-2002, 03:34 PM   #3
LQ Newbie
Registered: May 2002
Distribution: Redhat 7.3
Posts: 2

Original Poster
Rep: Reputation: 0
Thanks for the help!

I think I'll go with all lower case user names. That probably will make it a lot easier if people try to send e-mail to as most people don't check case sensitivity in names.

Thanks again! Now I can start setting up qpopper


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