I am using ZCS 6.0.4 and i experience problems when i try to create a meeting with attendees :
- the meeting entry gets created
- attendees does net received the meeting request and i receive back the mail inviting the attendees (undeliverabele) :
Note: Soap Fault. Please recreate and resend the message. Details below:

Error Code: account.AUTH_FAILED

Error Text: authentication failed for my_bes_user@mydomain
However, i can send and receive emails, and everything else is working fine !
How can i fix this problem ?