For the first question, yes, but only for a short amount of time. When in your
hotbox, choose the option that reads
out box near the top. You can then see messages sent within the last two days.
To answer the second question, once a message has been sent to another member, there is NO way to retrieve it. This is because it could have already been sent by email, etc. With great power comes great responsibility.
If this does not answer your question, choose another topic or click here to contact support.