Field Name,Description,Multiple Appearances,"Related ""Feedback-Type""",Reference,Status
Arrival-Date,date/time the original message was received,No,any,[RFC5965],current
Auth-Failure,Type of email authentication method failure,No,auth-failure,[RFC6591],current
Authentication-Results,results of authentication check(s),Yes,any,[RFC5965],current
Delivery-Result,Final disposition of the subject message,No,auth-failure,[RFC6591],current
DKIM-ADSP-DNS,Retrieved DKIM ADSP record,No,auth-failure,[RFC6591],current
DKIM-Canonicalized-Body,"Canonicalized body, per DKIM",No,auth-failure,[RFC6591],current
DKIM-Canonicalized-Header,"Canonicalized header, per DKIM",No,auth-failure,[RFC6591],current
DKIM-Domain,"DKIM signing domain from ""d="" tag",No,auth-failure,[RFC6591],current
DKIM-Identity,Identity from DKIM signature,No,auth-failure,[RFC6591],current
DKIM-Selector,Selector from DKIM signature,No,auth-failure,[RFC6591],current
DKIM-Selector-DNS,Retrieved DKIM key record,No,auth-failure,[RFC6591],current
Feedback-Type,registered feedback report type,No,N/A,[RFC5965],current
Incidents,expression of how many similar incidents are represented by this report,No,any,[RFC5965],current
Original-Mail-From,email address used in the MAIL FROM portion of the original SMTP transaction,No,any,[RFC5965],current
Original-Rcpt-To,email address used in the RCPT TO portion of the original SMTP transaction,Yes,any,[RFC5965],current
Received-Date,"date/time the original message was received (replaced by ""Arrival-Date"")",No,any,[RFC5965],historic
Reported-Domain,a domain name the report generator considers to be key to the message about which a report is being generated,Yes,any,[RFC5965],current
Reported-URI,"a URI the report generator considers to be key
        to the message about which a report is being
        generated",Yes,any,[RFC5965],current
Reporting-MTA,MTA generating this report,No,any,[RFC5965],current
Source-IP,"IPv4 or IPv6 address from which the original message
        was received",No,any,[RFC5965],current
SPF-DNS,Retrieved SPF record,No,auth-failure,[RFC6591],current
User-Agent,name and version of the program generating the report,No,any,[RFC5965],current
Version,version of specification used,No,any,[RFC5965],current
Source-Port,TCP source port from which the original message was received,No,any,[RFC6692],current
Identity-Alignment,"indicates whether the message about which a report is
      being generated had any identifiers in alignment as defined in [RFC7489]",No,auth-failure,[RFC7489],current