Build a practice send gate in this folder. Touch nothing outside it: no real mail, bank or network, and ask me for no secrets.
Every outgoing message (mail, payment, delete) passes the gate. Mail to our own address goes direct; any other mail and any
payment up to a maximum waits in a queue until I approve or reject it; deletes and payments above the maximum are refused.
"Sending" only means writing a line in a file. The rules live in a separate file. The queue keeps the full text, and approval
sends exactly that text.
I check it by sending one of each kind: the answers must be direct, waiting, waiting, refused, refused.
