Request For Comments storage

	Author Info E. Allman 2004, September SMTP Service Extension for Message Tracking 2004, September An Extensible Message Format for Message Tracking Responses 2006, April SMTP Service Extension for Indicating the Responsible Submitter of an E-Mail Message 2007, May DomainKeys Identified Mail (DKIM) Signatures 2007, November Email Submission Operations: Access and Accountability Requirements