I would send this same email (from [email protected]) to everyone:

A new trading account is available for you.

To activate it, please:
  1) Respond to this email with the words "I accept"
  2) Then, log in to https://InvitedTrading.com using username=<your email> and password=<private details>
      <private details> is a string of first name, last name, birthdate, and social security number
      E.g., "JohnDoe06251984123456789" for John Doe, born June 25, 1984, with social security number 123456789
   If desired, you can then change your username and password

Or, do nothing and all will be deleted in 48 hours.

If you do not trust https://InvitedTrading.com or have any reason to doubt that they should already know your
private details above, please do nothing.

I would send this same email (from [email protected]) to everyone (the only difference between emails is a long auto-generated account code # which cannot be brute-forced):

A new trading account #3298889119019881 is available for you.

To activate it, please:
  1) Respond to this email with the words "I accept with password suffix X"
  2) Then, log in to https://InvitedTrading.com using username=<your email> and password=<3298889119019881 + private details + X>
      <private details> is a string of first name, last name, birthdate, and social security number
      E.g., "3298889119019881JohnDoe06251984123456789f76djisuh" for John Doe, born June 25, 1984, with social security number 123456789, with X=f76djisuh
  You must then change your password and can change your username if desired

Or, do nothing and all will be deleted in 48 hours.

If you do not trust https://InvitedTrading.com or have any reason to doubt that they should already know your
private details above, please do nothing.