Hmm, maybe try:
While having mailbox and profession craft panel open:
Spam button 1: craftmacro etc etc ..........
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After awhile.. EMA addon warns that you are out of bagspace.
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Send all using TSM group mailing (if you want to send stuff to another character).
(hm.. maybe there is a macro command for this.. might be worth checking out).
If not, you can have both windows up anyway and with TSM mailing its just a click or two.
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Start spamming button nr 1 again.
or:
Press button 2 a bit: which targets the vendor nearby, interacts, then auto sells the items you want, using the addon of your choice).
I've not found a mailbox and a vendor standing so close that i could interact with both without having to move a few more inches (which breaks the other sadly). Not that ive done any big research on this: ive only had to move forwards and backwards ever so slightly to talk to vendor / open mailbox. It hasnt been a dealbreaker.
Edit: i tried to mount up using the auction house dino mount next to a mailbox: i could not have both vendor window and mail window up at the same time.
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Alternatively try out:
Have vendor window and the profession craft panel open at the same time: then spam the craftbutton macro and as soon as the item appears in the bags, it gets automatically sold. Might need "re-triggering" though (need to close and open window to start selling stuff again). EDIT: i tried this, but it wont start to sell the new items i craft, have to close and re-open the vendor window: however: with some creative isboxer "remapping", you might be able to use macros and/or interacts to "close the vendor window, then reopen it (interact with the vendor) to open it (so it can sell items again).
There is no automatic way to send items thru the mail / press the tsm group mailing, "at the exact moment you run out of bagspace".
