in case you are wondering, this is for letters of recommendation that I am writing for myself because nobody will write it for me. I want to send someone 2 PDFs and make it look like they are coming from 2 different people. I am going to sign up for 2 different email addresses for this purpose. I will go to 2 different Mcdonalds so my ip is different. Is this good enough, or can they still know the PDFs are from the same person? will they see the user's name on my computer? can they analyze the PDFs and somehow figure out it came from the same computer? should I send one from windows 7, the other from linux? or it doesn't matter? what are some things that can give away the fact that both emails came from the same person?