Over the years I've accumulated >1000 auctions that I keep reposting. The AH is a kind of temporary storage for me, as I would never have enough space in any of my character's bags/banks/... to put all my auctions.

Now, a lot of stackable items are "fragmented" in the AH: because of the 50 mails limitation, I might get and repost a stack of 10 ores, then another stack of 12 ores will come up later in my mailbox. I'd like to be able to "restack" all the partial stacks that I have on the AH. This would significantly reduce my mail size.

Is there a way to do that with TSM or other? A "cancel scan" that could defragment, maybe? Or do I have to do it by hand? Or maybe I should just finally invest in a guild bank?