SuSE Support Database

Title: Mailer daemon: user unknown

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Mailer daemon: user unknown

Symptom:

In e-mails to an user comes only a mailer daemon's user unknown , although everything seems to be correctly configured and the user is in /stc/passwd.

Cause:

The user's name contains one or more capital letters. Here it is first made the conversion into small letters (in e-mails the small/capital writing must be the same) and afterwards is checked, whether the user is in /etc/passwd or not.

Solution:

It has been long discussed, whether this is a bug or not. Firstly we will invest few time, to repair it because it is extremely unusual (up to now only one person has reported it).

Change the loginname into small letters!

Stephan Hegering (sh@leverkusen.netsurf.de) writes about it:

You must edit /etc/sendmail.cf ;-) At the appropriate mailer in this mailer specification, add an u at the flags (F=...). Hint,look for electric after "Mlocal,".
F=u --> Preserve uppercase for username
Otherwise the address's userteil is converted into lowercase.

This tip is not mine, but Dieter Brueggemann's (Bert@stud-mailer.uni-marburg.de)

Hint: do not forget to set afterwards in /etc/rc.config SENDMAIL_TYPE=no, with this, /etc/sendmail.cf is not overwritten again.

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Keywords: MAILER, USER UNKNOWN, PASSWD, SENDMAIL

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Feedback welcome: Send Mail to kfr@suse.de (Please give the following subject: SDB-passwd)

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