I've got some issues with authentication.
The situation at the moment:
- authentication for IMAP access is working
- authentication for POP access is working
- authentication for SMTP fails
- authentication for SOAP requests fails (e.g. CalDAV requests)
I mainly have a hard time figuring out where in the logs I could find some useful information. The only thing I was able to find in the logs comes from 'zimbra.log':
The same is logged if SMTP authentication is tried with SASL CRAM-MD5.
Jun 27 11:50:26 server.domain.com postfix/smtpd: warning: client.host.name[xxx.xxx.xxx.xxx]: SASL PLAIN authentication failed: authentication failure
Configuration in regards of authentication options for the server in question are:
What would be a next step to debug this situation?
Thank in advance for any hints.