Encoding/decoding text in email message

How do I obfuscate an email address

[roitracker]

I often receive emails that contain a tracking link to online content, but my email address (used as a unique identifier) is encrypted/obfuscated to try to hide the fact that it's tracking me.

I would like to do the same (encode specific values so they are encrypted/obfuscated within the message body & then decode server-side). How do I do this using perl?

[DrDoc]

Well, short of developing your own encryption/decryption algorithm...

1) Store the e-mail address in a database
2) Each address also has a unique identifier (an MD5 hash would work)
3) Pass the MD5 hash with the link
4) Find an e-mail address in your database with the matching MD5 identifier