Why can’t I delete emails stuck in the exchange queue?

I have some emails stuck in my outbound queue of exchange server 2003, some of which been there for almost a month. These are for domains which are mostly spam and some misspelled ones. I go into the queue, find messages and they have no sender id or properties. It gives me options to delete with ndr and without ndr but none of them work.

I have tried restarting information store service, restarting the server but none of it works.

Any help would be greatly appreciated.