The patent pending RAPNAP (Return Address, Peer Network Address Pair)
database is the key to pay2send universal e-mail identity technology.

Instead of blindly trusting the trivially forged return address on
an e-mail message, pay2send pairs the return address with the
network address of the relay from which the e-mail was received.

A RAPNAP can be checked by accessing the pay2send RAPNAP web service,
http://www.pay2send.com/cgi/rapnap/check.  The rapnap check
web service is only available by subscription.  Each user of the RAPNAP check
service has a unique password key that is used to authenticate themselves.

The following price schedule is subject to change.

The first 99 checks for any one account each day are free, and after
your 100th check each day, your account will be debited on a smoothly
sliding scale calculated in such a way that for a 30 day month,
a user of exactly 100 checks each day will be charged ten dollars,
a user of 1100 checks each day will be charged twenty dollars,
10100 checks each day costs forty dollars a month, and so on,
according to the logarithmic formula

	daily_bill = ( 10 / 30 ) * 2 ^ ( log10 ( daily_count - 100) - 2 ).


Accounts are debited every 24 hours, and account statements itemized for
each day are sent out each week.

The RAPNAP check web service is a standard CGI program that
recognizes three variables:

	1] RA: the return address, which must (at this time) be
	an e-mail address matching the regular expression
	/^[\w\.\-]+\@[\w\.\-]+$/

	2] PNA: the peer network addressm which must (at this time)
	be an IPv4 address in dotted-quad format
	/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\$/

	3] key: an account password key for the account to log this
	RAPNAP check request to.

Terms Of Service:

Subscribers to the pay2send RAPNAP database are expected to refer to
the database as an aid in determining the legitimacy status of
otherwise unauthenticated SMTP e-mail messages.

To request a RAPNAP check user account initially loaded with ten
dollars, send an e-mail to rapnap_check_subscribe@davidnicol.com with
"RAPNAP SUBSCRIBE" in the subject line.