title: Sending Email Broadcasts
body: <p>I'm working on an application that will allow management to send registered users (opt-in) broadcast emails at regular intervals, or based on various other criteria.  In any case, I'm curious as to whether I should send a separate email to each recipient or bcc all of them on a single message.  Currently the email list would be about 1500 recipients, but it should scale all the way up to at least 25k without problems.</p>
  
  <p>Thoughts?  Am I getting into a range that I need to worry about being put on spam lists?</p>