I can delete posts from my inbox, but can't delete posts sitting in my outbox.

I've just blurred some parts for privacy sake but, as you can see, both delete and archive button are completely missing (this is my Outbox).

In my inbox buttons exist on their designated spots correctly.

Possible cause:

• Does this mean posts are linked in such way so when I delete my received mail in my inbox, it gets deleted in my inbox AND in senders outbox?
• Does this also mean I can't delete anything from my outbox myself BUT when person who I sent it too deletes it in HIS inbox it will be deleted from his inbox AND my outbox in the same time?

If this is the case, I'd guess this is not how it's supposed to work. :) You may want to check this out.