All the free web mail services, Hotmail, YahooMail etc include the originating IP address of the sender for exactly this reason, so that spammers using the service can be traced.
Anyone with some technical ability and a google search should be able to find out how to successfully spoof an IP address or find and exploit a badly configured mail server, but really the easiest way to do it is to go to an internet cafe and use one of their PC's. Don't forget to pay cash.
Having said all that, and as has been pointed out, the legality of this is questionable at best. If the intent of your mail bombing is to disrupt the targets mail system or internet service, it is illegal. If you use an open relay to do it, it's illegal. If you actually succeed and cause the intended disruption, it is illegal.
Besides which, if the sysadmins running the mailserver you are targeting are at all on the ball they will spot what is happeing and /dev/null all the incoming mail within a few minutes and stymie your attempted attack anyway. Then they will start trying to figure out where it came from.
If you really want to get back at someone and you know their email address there are many, many, websites out there supplying what may be described as "questionable content". They usually offer a nice and easy way to subscribe to them, very often without requiring any form of confirmation. Explaining to the powers that be just why your inbox has suddenly filled up with jpegs from www.twogirlsandadonkey.com can be hazardous to your career path.
Anyone with some technical ability and a google search should be able to find out how to successfully spoof an IP address or find and exploit a badly configured mail server, but really the easiest way to do it is to go to an internet cafe and use one of their PC's. Don't forget to pay cash.
Having said all that, and as has been pointed out, the legality of this is questionable at best. If the intent of your mail bombing is to disrupt the targets mail system or internet service, it is illegal. If you use an open relay to do it, it's illegal. If you actually succeed and cause the intended disruption, it is illegal.
Besides which, if the sysadmins running the mailserver you are targeting are at all on the ball they will spot what is happeing and /dev/null all the incoming mail within a few minutes and stymie your attempted attack anyway. Then they will start trying to figure out where it came from.
If you really want to get back at someone and you know their email address there are many, many, websites out there supplying what may be described as "questionable content". They usually offer a nice and easy way to subscribe to them, very often without requiring any form of confirmation. Explaining to the powers that be just why your inbox has suddenly filled up with jpegs from www.twogirlsandadonkey.com can be hazardous to your career path.
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