We have suddenly observed that some mails are getting stucked into submission queue.Upon analyzing the sender and recipient of the mails got stucked on the queue we have identified that recipients of those mails are located on a particular exchange database.
We have observed an error "Can not open the mailbox /o=<orgname>/ou=exchange administrative groups......../cn=microsoft system attendant while trying to open any of the above mailboxes from ECP console whose mails got stucked in queue.
Not everybody of the same database was having the issue of mail got stucked in queue or "can not open the mailbox....".So it may not be a db level issue.Also some other database mounted on the server was not having the same issue.So this may not be a exchange server level issue.
None of the database are showing dismounted also..All are mounted.
But out of the mails which got stucked in the queue; all the recipient had the "can not open the mailbox.....Microsoft system attendant" error.
I have tried to move the effected mailboxes to some other database but those are not getting moved also.
What can be the issue...Please advise me....Please let me know in case of anything needed.