In every Company , people change. So it always creates a disconnect between the Company and the external stake holders . Mails bounce or go unanswered. To overcome this problem, most of the Companies have a few public email id’s which never change. For example sales, info, service, etc. These are usually listed and given to Customers , vendors and other stake holders. This ensures that even if the person handling that function leaves the Company , the email id need not change.
with warm regards
Microsoft MVP 2009
Microsoft Worldwide Partner of the Year 2011 & 2007