This email with the subject "Returned mail: see transcript for details" was received in one of Scamdex's honeypot email accounts on Mon, 02 Feb 2015 05:55:20 -0800 and has been classified as a Generic Scam.
The sender was email@example.com, although it may have been spoofed.
Dear user of dumbtube.com, Your email account was used to send a huge amount of spam during the last week. Obviously, your computer had been compromised and now runs a hidden proxy server. We recommend that you follow the instructions in order to keep your computer safe. Have a nice day, The dumbtube.com team.