Cellphone at mailbox

Program phone with 1 key dial facility.
Add contact across key.
Add contact across call terminate key.

Mail happens:
  Contact closure / contact opened
    Call originated.
Wait N seconds
Call terminate

Called phone records a missed call from the mailbox.

For extra points distant phone could also be dedicated to this task, so
that if it rings, there's mail.

Airtime cost of this will vary with country.
In NZ a prepay phone's credit typically lasts 12 months and minimum topup
is AFAIR $20.
Old phones cost ~=3D $0 each.
The really chintz could use up the remaining credit on 'real' calls after
say 11 months

_____________________

HF tx will 'cross' your hill.
AFAIR there is a ISM band at 134.120 MHz in most countries.
That will usually give you local terrain independent coverage.


  Russell
--=20
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