How to empty mail queue has 40,000 pending emails for 13 days

[Sudhakar Arjunan]

Dear Team,

Mail queue remove/empty in db

Mail queue statistics
Queue length - 40,652
Oldest Mai - l13.6 Days

[Sir Osis of Liver]

Unless something's broken, you should be able to empty queue in Admin -> Mail -> Browse Queue.  You really need to determine why queue is not sending mail.