By using public key cryptography digital technology users can verify the author and contents of an electronic message. Once signed, the message looks like this . This shows Fred that the message is indeed from Joe, and is exactly as Joe wrote it. Pseudonymity is really just a matter of adopting a handle, or pseudonym. The most common pseudonymity online is simply using your email address as your name.
Anonymity is more problematic.
The most important question is whether or not you want the recipient of your message to be able to reply. The most common means of anonymous communication are remailers . If you simply want to send a message to your recipient, then you want a one-way anonymous emailer . On the other hand, if you prefer that someone be able to answer you, then you'll want something that can handle replies. The difference between the two is that the two-way mailer must keep a record of your email address.