I have a few suggestions for you.
The first one relies on The Onion Router also known as Tor.
Since you are crossing to the dark side, why not also take a look into the darknet?
Take a look at this list of Tor email providers. If you have your own email server that can be accessed through Tor, it becomes much harder for anybody to stop people from using this service. After all, Tor was developed to offer people uncensored access to the web.
You can read about Tor in detail here, it uses Onion Routing and this is how you would set up your server to use Tor.
Here is an example how you could use it:
The steps that involve the setup, receiving an URL request and sending back the reply are as follows:
- Set up an email server.
- Configure your email server to use Tor.
- Publish the public service name. (e.g. “duskgytldkxiuqc6.onion”)
- Deploy a client that takes the service name and a URL, and let it send an email with a request to your server.
- The client now waits for a reply.
- You send a reply and the client receives it.
You can change your service name on a regular basis, but you need to make it accessible to those who will use this service.
Having an own email server means being able to control the email header.
Here is one example how you could make use of it:
- Configure your email server so that it receives and recognizes
emails which contain the requested URLs. - Before you send a reply modify the email header so that it shows a random IP address and a random sender email address including a random domain name.
- Send your reply.
Sending an email that way means that you cannot be replied back to. But since your reply already contains the requested information there is no need to.
I hope this helps.