As someone who is responsible for filtering mail, there are a number of options that we have when it comes to filtering spam. We can do any of the following:
Reject it in SMTP with an error message
Quarantine the message to cloud storage
Mark it with an x-header so that the user can filter it in their mail client without having to log in to a spam quarantine
Modify the subject line and do the same as above
Redirect the spam to another alias, such as an admin account (don’t know why you’d do this, but some people do)
Silently drop the message
These are not all the options there are, but they are the most common. Of the ones above, the first five are good ideas. The last one is a bad idea.
Why?
Get the answer here:
http://blogs.msdn.com/b/tzink/archive/2011/08/09/why-silently-dropping-mail-is-a-bad-idea.aspx
Until later,
Henrik Walther
Technology Architect/Writer/MS Vendor
MCM: Exchange Server | MVP: Exchange Architecture