Cath - when my Inbox got to about 100 that's when they started rejecting??
But it may depend on the length of them - and you may be able to move them to folders which "frees" up space in your Inbox (or you may not!) I didn;t manage to work out how to do this
I think you may be having the same troubles I did for the August Quiz? I just ended up being very ruthless with what I kept
