I received the following email, addressed to me at an email address on my personal domain (for which I run my own mail server on a VPS):


  FORWARD THIS MAIL TO WHOEVER IS IMPORTANT IN YOUR COMPANY AND CAN MAKE
  DECISION!
  
  We are Armada Collective. lmgtfy URL here
  
  Your network will be DDoS-ed starting 12:00 UTC on 08 May 2016 if you
  don't pay protection fee - 10 Bitcoins @ some-bitcoin-address
  
  If you don't pay by 12:00 UTC on 08 May 2016, attack will start, yours
  service going down permanently price to stop will increase to 20 BTC
  and will go up 10 BTC for every day of attack.
  
  This is not a joke.
  
  Our attacks are extremely powerful - sometimes over 1 Tbps per second.
  And we pass CloudFlare and others remote protections! So, no cheap
  protection will help.
  
  Prevent it all with just 10 BTC @ some-bitcoin-address
  
  Do not reply, we will not read. Pay and we will know its you. AND YOU
  WILL NEVER AGAIN HEAR FROM US!
  
  Bitcoin is anonymous, nobody will ever know you cooperated.


Obviously, I'm not going to pay the ransom.  Should I do anything else?

Update:

I forwarded the email and original headers to the originating ISP.  They replied that "Measures have been taken."  So, umm, yay?  I guess?

Based on the following article you may simply want to ignore it. This seems to be a common scam and your e-mail looks almost exactly like the one from the following article.

http://arstechnica.com/security/2016/04/businesses-pay-100000-to-ddos-extortionists-who-never-ddos-anyone/

Look up the source ISP of the service provider that sent the e-mail and contact their abuse team  abuse@company.com. They may disable the source of the e-mails or alert the unsuspecting customer that may own the machine. Notifying the source ISP is helpful to reduce the amount of this. Make sure you send them an e-mail with full headers. If the source appears to be a compromised system at a large company I would notify them in addition to the ISP. Do this by CC'ing both the company and the ISP at the same time for fastest results. Keep in mind some malicious systems may also be impersonating as a compromised host even though it's not so notifying the ISP may actually be more important than notifying the owner of the system.
