This is good news: it seems as if Apple's quality control is improving. After all, there is no report here of Mail.app actually deleting messages[0] [EDIT: oh, well] or sending out hundreds of copies of a message.[1]

Despite this improvement, however, I think I shall continue to avoid this company's software in favor of more mature, open source solutions.[2]

  [0]http://discussions.apple.com/thread.jspa?messageID=12758081&tstart=0
  [1]http://lee-phillips.org/iphoneUpgradeWarning-4-2-1/
  [2]http://www.mutt.org/ (http://www.washington.edu/alpine/ might be OK, too.)