2. 2-day limit. Many things here, but items coming back to email with deposit and single item/block per email is a gigantic pain in the arze for someone like me who crafts and sells every leveling purple for each crew skill across several alts. I also purchased the 90 slot unlock. So it's annoying to have to wade through 60-70 emails every two days and click to get my item back and also click to get back the deposit. Better solution would be to enable a "refresh" that would allow you to go an click refresh sale and pay the deposit each time (heck, even put a cooldown on it). Only if you fail to refresh do your items go back to email.
I wish there was a longer list time too, but you know there is a "take all attachments" button in your mailbox, right? Just mark the checkbox for each returned email and use that "take all" button and it will automatically give you back your creds and items from the selected emails.