Spam Filtering has been enabled across the system.  If you have a POP3 or IMAP account with VPOP, you can massage the setting in your mail admin area.  The spam filtering works by evaluating inbound mail and if it meets the general "score" of your level of spam filtering, it will either be passed through to you or bounced to the [apparent] sender.  If you have filtering on your email client, you may opt for the "Tag Only" mode which adds a header to your messages and provides a score which you can then filter upon.