The email says thanks for buying early bird tickets, it was neutral but owing to demand, the area you are in is for Notts fans, NO LONGER NEUTRAL, ERGO... if you purchased Neutral tickets, do not wear Borehamwood or Bromley colours if a supporter of those clubs.
If that makes sense?
They messed up the mail as if a Notts fan and already in with Notts fans, you should not have been sent the mailshot.