SMTP Auth failure debian 3.1 sarge

[dschmid]

Hello, I installed a new server this week. I followed perfect and everything works fine. I created a webaccount and an emailaccount.

Sending emails with outlook is okay. But receiving not. /var/log/auth.log gives me this error:

Apr  2 18:49:41 h778760 saslauthd[833]: do_auth         : auth failure: [user=web1_myaccount@mydomain.de] [service=imap] [realm=] [mech=shadow] [reason=Unknown]

I thinked it was the pam authentification so I reconfigured /etc/default/saslauthd to use the shadow method. But still auth problem.

myhostname:~# testsaslauthd -u web1_myaccount -p mypassword -f /var/spool/postfix/var/run/saslauthd/mux

gives me that:

0: OK "Success."

But when I try:

testsaslauthd -u web1_myaccount@mydomain.de -p mypassword -f /var/spool/postfix/var/run/saslauthd/mux

I get:

0: NO "authentication failed"

So is the domain extension is the problem?
I hope it isn't a big problem. Thx for help.