The first was when someone emailed Luke Rudkowski, Founder of We Are  Change and tried to trick him into opening attached jpeg files  containing child porn.   Luke was able to use the "view" function of his  email to see that the images were child porn and he did not open them.
Then, someone using a tormail account tried to do the same thing to  Dan Johnson, Founder of People Against the NDAA (PANDA).   Whoever  emailed Dan Johnson pretended to be me, Stewart Rhodes, but using a  Tormail account.    Fortunately, Dan knew that I don't use Tormail, and  therefore he did not open the attachments.   Instead, he had a computer  security expert examine the files, and that expert determined that they  contained child porn.   You can read more about that attack, and watch a  video we made about it, here.
Well, a few days later it happened again, to two other liberty  activists we know.   They have chosen, for the time being, to not go  public about it, in the hopes that the FBI will have a better chance of  catching the perp.  All of us have reported these incidents to the FBI,  through attorney Sue Basko.
Sue has written a very well done description of what happened, what  we did to report it, and some important advice on how you can keep from  being victimized by whoever is doing this.   Here is an excerpt of that  tutorial.  Please take her advice to heart, and be very careful online.
Child Porn Emailed to Activists to Try to Frame Them
by Sue Basko
See alsoabout Luke Rudkowski receiving similar email
I have been assisting a group of activist men to whom someone emailed   child porn in an attempt to set them up for criminal charges.  Whoever   is doing this is extremely sinister. 
  I am writing this to warn others to beware. I'll give specific info on what to do if it happens to you.
 
First, Luke Rudkowski, a media activist at We Are Change, was sent  child  porn via email while he was in Europe and crossing borders  between  nations.  Luckily, he previewed the images and reported the  situation to  the FBI at the Embassy in the city he was visiting.
Then, Dan Johnson of PANDA (People Against the NDAA) received an  email  that looked like it was from Stewart Rhodes of Oath Keepers.  Dan  was  suspicious of the email because he had heard about what happened  to Luke  Rudkowski.  Also, the email was a tormail account, which is   untraceable, and Dan did not know Stewart to use such an account.  In   addition, there were attachments.
 
Dan did not open the attachments, because he was suspicious of them.    Instead, he gave access to his email account to a computer security   expert.   The expert opened the files in a live forensics environment,   and saw they were child porn images.  The method he used did not leave   the files on his computer or drive.  The metadata on the files was fixed   to the names of Stewart and Oath Keepers, to make it look as if the   pictures came from Stewart.
 
Two days later, the same scenario was repeated, with two men from   different organizations.  The same computer security expert examined   those files, and found they were the same images as in the previous   email, but the metadata on the images had been changed to match the name   of the supposed sender and his organization.
Whoever did this attempted to set up both the men in whose names they   were sending the emails, as well as the men who were to receive the   images.  This is evil to the max.
 
WHAT WE DID:
I made a group report to the FBI on  behalf of all  the men, including the computer security expert.  With  all the  information neatly arranged in one report, hopefully the FBI  will be  able to get some leads on who is behind these dastardly set-up  attempts.   The men are from all over the nation, so filing separate  reports would  have diluted the reports' effectiveness for law  enforcement purposes.   A good deal of forensics examination has already  been done by the  computer security expert, and hopefully, he will be  able to share his  information with the FBI.
 
WHAT TO DO IF IT HAPPENS TO YOU:
If you receive such  an email,  try to get the files checked out by a security expert before  you open  them.  In any case, you MUST make a report to the police or  FBI, because  there is child porn involved.  It is illegal to view,  possess, or pass  child porn.  The criminal penalties are extreme and  include forfeiture  of assets, including homes, cash, and personal  belongings.  Therefore,  even the computer security person has to file a  report.
 
 
By law, you are required to make the report to a law enforcement  agency  promptly, and to either destroy the images or make the images  available  to law enforcement.  I'd say wait and see if they want the  images before  you destroy them.  Also, don't delete the email until you  file your  report, because the routing information on the email may be  helpful to  police.  Also, you need to alert the person whose name was  put on the  email as the sender.  You need to let that person make a  police report,  too.  They have been as victimized as you have, if not  moreso.
 
If you receive such an email and open the files, you are likely to be   shocked, or to feel shame, fear, or a desire to push this away and   pretend it did not happen.  You can't do that because you need to report   it so you don't risk being caught up in child porn charges, even years   down the line. If you need to go to therapy or seek other help to work   out your shock over seeing the images and being set up, you should do   that, but promptly make the police report.  Keep in mind that someone   is, in fact, targeting you specifically and trying to harm you terribly.   Therefore, it may be wise to take extra safety precautions for  yourself  and your family.
 
WARNING SIGNS THAT AN EMAIL MAY CONTAIN CHILD PORN:
 1) Use of tormail account or other untraceable email account.
 2) Uses the name of someone you know, but from an email account you don't recognize.
 3) Has jpegs or pdf files attached.
 4) Has an email message that DOES NOT HINT at the files containing child   porn, but encourages you to open the files and spread them to all your   friends/ compatriots.
 5) The email  may have veiled threats against you or your group.
 
WHAT TO DO:
 1) Don't open the files.  Try to get help from a computer security expert.
 2) If there is child porn, REPORT THE SITUATION TO THE POLICE OR FBI.
 3) Share what happened to warn others.
 4) Take care of yourself.  Talk to a friend, get counseling if needed,   take safety precautions for yourself and your family, etc.
 
 
Read the rest here.   Be sure to go to Sue's site, and thank her for her help.
http://subliminalridge.blogspot.com/2013/07/child-porn-emailed-to-activists-to-try.html