The IRS describes its system for storing emails. As I noted here, emails reside in user accounts on email servers: The IRS email system runs on Microsoft Outlook. Each of the Outlook email servers are [sic] located at one of three IRS. Setup Your Own ActiveSync Server With Zimbra and Z-Push. (this is your mail relay server and ActiveSync and Webmail Proxy Server). both on windows. MDaemon FREE mail server…