How To send 10 CAN IDs

[Pk432]

I want to send 10 CAN IDs at a time. But as my STM32F413VGT6 has 3 Tx Mailboxes I am able to send only 3 IDs

Is there any function to empty Tx mailboxes?

Or is there any other way available to send all IDs at once without emptying mailboxes?