Outbox and Sentbox

[Uwe Bahr]

Salvete dear moderator team,

I have a question because I found no answer with my search function.
I answered two PM's and sent them. But they didn't appear in the Sentbox but in the Outbox - will the latter one be emptied periodically and I have just to wait until they are sent or have I made some kind of mistake?

Thanks in advance - Uwe