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IP user identification for limiting of multiple test users

Dear freelancers,

for this project I need an expert concerning limiting multiple test users.

I´m the author of a daily newsletter which is sent to paying customers.

At the beginning of a test periode people can test for some days my newsletter for free.

After this test periode a certain amount has to be paid.

At the moment people register only with their name and email address.

HOWEVER, BIG PROBLEM IS THAT USERS ONLY CHANGE THEIR EMAIL ADDRESS AND THEN ORDER FOR ANOTHER TIME A FREE NEWSLETTER WITHOUT PAYING FOR IT.

So, it would be your job to advise me how to solve this problem over IP address recognition of my contact formular and by sending my newsletter to people where I will be informed which newsletter is read by same IP address but different email address (in the end it is read by the same person).

You should implement a new contact form which is connected to the server of my website and where the contact form is recognizing that the user has already sent an email with an other email address but with same email address.

I´m not the computer expert but I would have several solution for solving this problem. But I do not know how to implement to my websites.

This project should be completed within 3 days.

You should take this project very serious and should have already some references here on [url removed, login to view]

The max. budget for this project is USD 100.

Thx for bidding and good success

Bernie

Færdigheder: Computer Sikkerhed, PHP, Software Arkitektur, Web Sikkerhed

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Om arbejdsgiveren:
( 60 bedømmelser ) London, Austria

Projekt-ID: #964892

1 freelancer byder i gennemsnit $100 for dette job

MAST3R

You have pm

$100 USD in 2 dage
(11 bedømmelser)
5.6