New created users can not log in

[Ferdinand Gruber]

Hi,

I am using dovecot 2.2 for some time. All users on the system can log in 
using Horde Webmail.

But now, after creating a new user on the server with <useradd -m 
username> this new user is not able to log in. Of course I have set a 
password for the new user.

In the log file I can see:
Sep 16 23:04:05 servername auth: gkr-pam: error looking up user information
Sep 16 23:04:07 servername HORDE: [imp] [login] Authentication failed. 
[pid 1584 on line 730 of "/srv/www/htdocs/horde/imp/lib/Imap.php"]
Sep 16 23:04:07 servername HORDE: [imp] FAILED LOGIN for calendar 
(93.82.157.132) to {imap://localhost/} [pid 1584 on line 157 of 
"/srv/www/htdocs/horde/imp/lib/Auth.php"]
Sep 16 23:04:07 servername HORDE: [horde] FAILED LOGIN for calendar to 
horde (93.82.157.132) [pid 1584 on line 199 of 
"/srv/www/htdocs/horde/login.php"]

Please give me a hint.

-- 
Ferdinand