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http://www.irs.gov/irm/part1/irm_01-010-003.html
If you create or receive email messages during the course of your daily work, you are responsible for ensuring that you manage them properly. The Treasury Department’s current email policy requires emails and attachments that meet the definition of a federal record be added to the organization’s files by printing them (including the essential transmission data) and filing them with related paper records. If transmission and receipt data are not printed by the email system, annotate the paper copy. More information on IRS records management requirements is available at http://erc.web.irs.gov/Displayanswers/Question.asp?FolderID=4&CategoryID=5 or see the Records Management Handbook, IRM 1.15.1 http://publish.no.irs.gov/IRM/P01/PDF/31421A03.PDF).