Distribution List is more locked down in Exchange 2007 to reduce spam

posted by  techgeek (12)  8 months ago (blogs.msdn.com)

Distribution list is used for grouping users together, and emails can be sent to all members belonging to a DL.  In Exchange 2003, the default setting is that a DL accepts emails from any email addresses.  It can be configured to reject external email addresses and even internal addresses.  However, most users accept default configuration, and some DLs become susceptible to spam mails.

As a result, in Exchange 2007, DL is created to be secure by default.  External email addresses are NOT allowed to send an email to a newly created DL by default.  Of