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Send an email, then on a server (where the email is received), open up the email, and if it contains certain data, copy it to a file?
If it is this, you'll need something running to receive the email or something to check the inbox regularly. PHP has a load of imap functions (which also work with POP boxes), which can be used to log into a mailbox and read the emails from it.
You could set up a script that regularly checks a mailbox, and for each email in there that matches certain criteria write some data to a file and delete the email. It's not that easy but not that hard either if you know what you're doing.
Is that what you mean?
OK, I think I know how it can be done:
Have the email include an image, have the image URL as pockeymonkey.co.uk/image.php?variable=whateveryouwant.
When the request for the image is sent, it is processed by the php page which will store what the variable is, then print the URL which will be the full URL to a picture.
As it's all done by the server the only output will be a URL to an image which will appear in the email body. The variable will be stored by the server and nobody will ever know.
I think that's a way of doing it...