What is the ssh command for deleting the mail queue in linux server?
It depends on what you want deleted, just some email or all from the queue.
You can find more than enough info on http://bradthemad.org/tech/notes/exim_cheatsheet.php
Hope it will help you.
if you have WHM root level access i find this a LOT easier
this ones quite handy to perticually when theres a whole mailbox full of spam and you simply want to empty the whole thing