Mail::MIMEDefang::DKIM::ARC - ARC interface for MIMEDefang

Mail::MIMEDefang::DKIM::ARC is a module with a set of ARC related
methods called from mimedefang-filter to operate with ARC signatures.

md_arc_sign
    Returns an hash with mail headers and the ARC signature for the
    message. If ARC sign fails the hash will contain an error message.
    The method accepts the following parameters:

    $keyfile
        The path to the private ARC key

    $algorithm
        The algorithm to be used to sign the message, by default is
        'rsa-sha256'

    $chain
        The cv= value for the Arc-Seal header. "ar" means to copy it
        from an Authentication-Results header, or use none if there
        isn't one.

    $domain
        The domain to be used when signing the message.

    $srvid
        The authserv-id in the Authentication-Results headers, defaults
        to Domain.

    $selector
        The selector to be used when signing the message, by default
        it's 'default'

    $headers
        The headers to sign, by default the headers are: From Sender
        Reply-To Subject Date Message-ID To Cc MIME-Version Content-Type
        Content-Transfer-Encoding Content-ID Content-Description
        Resent-Date Resent-From Resent-Sender Resent-To Resent-cc
        Resent-Message-ID In-Reply-To References List-Id List-Help
        List-Unsubscribe List-Subscribe List-Post List-Owner
        List-Archive