If it's possible at all, could you put an option on here to delete multiple messages, even for the outbox? My boxes need to get cleaned out and deleting one at a time takes a long time. Thank you :)

Outbox messages cannot be deleted.

Deleting multiple Inbox messages at once is possible but requires good timing and doesn't always work.

I know that about the outbox, but if there was an option added for that it'd be possible. And a check mark system to delete messages would be very effecient

Yeah that and a search for in the outbox if you wanted to reread conversations.