Unfortunately i cant find such document that can help me to manage my incoming/active queues. But i find out the following answers of my question from different location, please correct me if i am wrong and give the answer which i dont know
1) Check incoming/active queue status through command line, qshape command give limited information.
2) To Increase incoming/active queue size
postconf -e 'qmgr_message_active_limit = 20000' (active queue)
postconf -e 'default_recipient_limit = 20000, (incoming)
3) In zimbra log i can only see the massage id, but i want to see the message subject.
4) Increase outgoing connections
5) Increase Spam and virus process
We are going in production and we still cant find answer of theses questions.