python3-authheaders: python3-authheaders (email authentication header) python3-authheaders: python3-authheaders: Python module for generating email authentication headers: python3-authheaders: Authheaders can generate both authentication results header fields python3-authheaders: and DKIM/ ARC sighatures. python3-authheaders: It can perform DKIM, SPF, and DMARC validation, and the results are python3-authheaders: packaged into a single Authentication-Results header. python3-authheaders: It can also DKIM and ARC sign messages and output the corresponding python3-authheaders: signature header fields. python3-authheaders: python3-authheaders: