Wow, that sucks. I'm sorry to hear that.
If you find that someone on the internet has plagiarized your work the FIRST thing you need to do is collect your evidence; you need to create a file that has LINKS to the plagiarized work and also SCREEN SHOTS (as a lot of the time if there's something fishy going on on a website, the pages will be taken down after a very short while--having a screen shot that has the address showing in the image, with the material in question, is very helpful in the event that your plagiarist has begun to cover his/her tracks).
Keep all your links and images in the same file.
To back up your evidence, you also need the material you believe was plagiarized, and to present an account of how such a thing might have happened--i.e., in your case you need copies of your work that was sent and to whom, a copy of the rejection letter, etc.
The NEXT thing you need to do is contact the webmaster on the site that contains the plagiarized material and notify them that you have evidence that your work has been cribbed from, and let them know that they are to take the offending material down immediately. Give them a certain amount of time to do that; DO NOT make any threats about lawsuits or whatever, just say, "This stuff is mine, I can prove it. Take it down immediately by this time tomorrow and leave it down, or I will take action."
A sane webmaster will probably have at least a suspicion that your claims might be legitimate, and will remove your plagiarized work ASAP to avoid trouble.
A webmaster that may be honest but somewhat clueless about the activity on his/her site may reply to your message and ask what you are on about. That is the time to present your evidence, and offer them another opportunity to remove the offending material.
If you get ignored or refused, then what you do from that point is really up to you. If you decide to pursue your claims in a legal court, make sure you can prove to the satisfaction of all that your work WAS plagiarized, or you'll end up out of bunch of $$$ with nothin to show for it, and the other writer gets away with copying from you. (That's why threatening legal action from the get-go is always a poor idea! Know whether you have any sort of a case BEFORE you talk about suing someone!)
If the site continues to refuse to take down the material, as a last resort you might want to contact the actual writer who borrowed from you, and appeal to his or her higher nature, ex--
"I would like to know how you came by the idea of a rabid, opera-singing, zombie robot as presented in your story 'Larry Bites Lorenzo' published in last month's issue of Zombie Tech Tales, as it is so similar to my story 'Lenny Likes Paolo' which I had submitted to ZTT back in August as to be indistinguishable. My story was alas rejected by ZTT. I also note from visiting the ZTT forums that you (assuming that your screen name is 'floatingfeather222') and ZTT's Editor-in-Chief, poisonpen99, are to all appearances best friends.
"It's true that 'imitation is the sincerest form of flattery', and believe me, I'm not in the least upset at the idea that another writer may have borrowed one of my ideas; I'm simply curious about the high degree of resemblance."
Somethin like that.
Good luck. I hope this was of some help to you.
~~~ yours in Chaos!
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