Here are a couple of form letters I send to people that send me unsolicited commercial email. To discover the identity of the orginal sender, I use the incredible SpamCop.
Feel free to use these verbatim or in modified form if you like. The more people out there trying to put an end to spam the better.
Subject: Your Junk Email (Was: ) Dear Net Abuser: I received the above unsolicited commercial email from you. I have to pay for my email, like most people. My private email facilities are not your advertising medium. You abused my resources and wasted my time, which is valuable to me. You are shifting the cost of your advertisement to your recipients, without their permission. That's like sending your junk postal mail postage-due, or like telemarketing collect. Or sending a junk fax--ooops, those were made illegal in the United States (under the Federal Telephone Consumer Protection Act of 1991). Why? Because the congress and the courts felt that forcing the recipient to pay the cost of advertising was wrong. I agree. Therefore, I will never do business with you or anyone associated with you. I will also be informing your Internet Service Provider of your abuse of resources. All legitimate ISPs prohibit this sort of abuse. Any further communication from you will be considered harassment, and will be dealt with accordingly. Graham Mitchell
Subject: Junk Email From Your Site: [original subject goes here] Dear Postmaster, A user on your system has sent me (and apparently many others) the following unsolicited commercial email. You are being contacted either because the message originated at your site, used your SMTP mailer, has replies directed to your site, or solicited visits to a web page hosted by your site. The message originated at XXXX using SMTP server XXXX the sender claims to be XXXX replies directed to XXXX removal requests are directed to XXXX the message solicits visits to the web site at XXXX I have to pay for my email, like most people, and I don't appreciate being forced to pay for unsolicited commercial messages such as this. My private email facilities are not an advertising medium for your users. This abused my resources and wasted my time, which is valuable to me. Even if the sender purports to honor requests to remove my address from their unwelcome mailing list, that does not make this cost-shifting acceptable--I did not sign up to any sort of LISTSERV or majordomo list in the first place, nor did I request any information from this user. It is abuse and forgery to put someone's email address on a mailing list without their permission nor knowledge. Likewise, if the sender's message claims that I will receive no other messages from them, it is still completely unacceptable that I (and other recipients) have been forced to subsidize the cost of this advertisement. I have received nothing of value in return for this unauthorized commercial use of my email resources. I have emailed the apparent sender to make it clear to this user that I will consider any further communication harassment. I respectfully request that you, as sysadmin, take whatever steps are necessary to prevent this from happening to me or anyone else again. No legitimate Internet providers allow this kind of abuse from their sites. Thanks, Graham Mitchell Dept. of Computer Science Leander High School [complete original message goes here, including headers]