Email Proibitions

[Tyrone Griffin]

I got the following error in CE 2.0v3 when trying to send out my 
newsletter (it's duplicated for every address in the list, but I only 
show one for space issues.)

Connecting to Internet using Account “TheBlackMailer”
   Sending mail using “smtp.mindspring.com”
      Sending 1 of 1
      Sending message “TheBlackMailer - Feb 2005”
  ** 550 relaying to <email address recipient> prohibited by 
administrator

I've had no problem doing this for years.
Can someone help me with this?  Thanks
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