Unusual E-mail Activity

I've been noticing unusual e-mail activities at my nyu account. 3-4 tomes in the past month I've got 'MAILER-DAEMON' failure notice e-mail when I've not send mails at those addresses.

An example is :

Subject

failure notice

Hi. This is the qmail-send program at mail.yifansoft.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

:
Sorry, no mailbox here by that name. vpopmail (#5.1.1)



So, have other people also been getting such emails too ?
And what could these signify ?

A video link to byzantine fault tolerant systems by M. Castro

Hi Class,

here is a video link to a lecture given by M. Castro on the topic of Byzantine fault tolerant systems. If reading the papers is a daunting task for somebody, this is an interesting alternative for sure.

http://www.researchchannel.org/prog/displayevent.aspx?rID=2128&fID=569


Produced by:
University of Washington
April 6, 2000

Speaker(s):
Miguel Castro, Massachusetts Institute of Technology

Runtime:00:54:40

Description:
The growing reliance of our society on computers demands that we provide systems with improved reliability, availability, and security. This talk describes BFT -- a new software Byzantine fault tolerance toolkit that addresses these issues. BFT can be used to build replicated systems that work correctly and remain available even when some of their replicas behave arbitrarily due to malicious attacks, software errors, or hardware failures.

A video link to byzantine fault tolerant systems by M. Castro

Hi Class,

here is a video link to a lecture given by M. Castro on the topic of Byzantine fault tolerant systems. If reading the papers is a daunting task for somebody, this is an interesting alternative for sure.

Produced by:
University of Washington
April 6, 2000

Speaker(s):
Miguel Castro, Massachusetts Institute of Technology

Runtime:00:54:40

Description:
The growing reliance of our society on computers demands that we provide systems with improved reliability, availability, and security. This talk describes BFT -- a new software Byzantine fault tolerance toolkit that addresses these issues. BFT can be used to build replicated systems that work correctly and remain available even when some of their replicas behave arbitrarily due to malicious attacks, software errors, or hardware failures.

Digg Mafia, Bury Brigade

Some say there is a group of digg.com users that work together to effectively censor digg posts.

There is debate whether this exists:

http://www.wired.com/news/technology/internet/0,72835-0.html?tw=wn_index_3

http://blog.digg.com/?p=66

http://www.pronetadvertising.com/articles/the-bury-brigade-exists-and-heres-my-proof.html