being sent box

unable to find a “being sent box”.
I’ve a message saying it’s impossible to send a message (gmail) because of it size …
I decided to delete it … but no way … no “to be sent” box … where I could delete it …
How to do ??
Thanks for help
and thanks for that wonderfull product …

the ‘To be sent’ box is called Outbox and you can find it under Smart folder sor Local folders.