Feeling Managed

Engage me! Survey says: you have not.
Contain me; it is a goal shot. Refrain
From seas; ponds are the best we can
Do. Bells ring to send the mail to the
Next town; wait for the carrier to get
Back from the castle and you'll have
All the surveying work you can see;
When does the mail come back, you
Ask? Of course, of course. The mail
Is only returned when there is a job
Already done: do not start until then.