When you send a regular email, it always displays the address of sender, as well as, other incidental information.
If a user posts an email from a Web-based email form, the IP address of the computer is attached to the email; hence, anyone with the appropriate software can retrieve this information. Those who want to maintain privcy while sending a mail, Gizbot has detailed the steps of sending Anonymous email with pictures.
Open send-email.org site.
Enter the email-id where you wish to send anonymous email. Eg: XXXXX@gmail.com OR XXXX@yahoo.com etc....
Enter Subject of the e-mail in one word.
Write your message and please note it should be longer than 500 characters.
Enter the Verification code, make sure it should not be a wrong code.
Finally hit the send button below the Verification code text box to send your anonymous email.
Please Note:You are not allowed to use the service for any illegal activities.