A copy of the letter in question (and application forms etc) are pinned to the AOA notice board in the mailbox room, so this is hardly a big deal. You could also go to the AOA website to "check it out" (if you are a member).
I think they are transferring things from the old mail boxes to new mail boxes at the moment, so this is probably a case of paranoia.
Dont you guys read your Notice's to Crew???