Hotmail moves to SPF authentication

Discussion in 'In The News' started by roundabout, Dec 11, 2012.

  1. roundabout

    roundabout VIP

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    Hotmail moves to SPF authentication

    Hotmail has recently stopped using Sender ID for email authentication and switched to authenticating with SPF. The protocol differences between SenderID and SPF were subtle and most senders who were getting a pass at Hotmail were already publishing SPF records.

    From an email in my inbox from September:

    Authentication-Results: hotmail.com; sender-id=pass (sender IP is 65.55.240.72) [email protected]; dkim=fail (testing mode) header.d=microsoft.discoverbing.com; x-hmca=pass
    X-SID-PRA: [email protected]
    X-SID-Result: Pass
    X-DKIM-Result: Fail(t)
    X-AUTH-Result: PASS

    From an email I just sent myself:

    Authentication-Results: hotmail.com; spf=pass (sender IP is 209.85.214.174) [email protected]; dkim=pass header.d=gmail.com; x-hmca=pass
    X-SID-PRA: [email protected]
    X-AUTH-Result: PASS
    X-SID-Result: PASS

    And, since we’re here, let’s look at how to read the Authentication-Results line.

    Authentication-Results: hotmail.com; spf=pass (sender IP is 209.85.214.174) [email protected]; dkim=pass header.d=gmail.com; x-hmca=pass

    Authentication-Results: header added by Hotmail to give authentication results.

    hotmail.com: domain doing the authenticating.

    spf=pass (sender IP is 209.85.214.174) [email protected]: Authentication results for SPF. This tells you what IP Hotmail received the email from, as well SMTP.mailfrom address they used when checking the SPF. In this case, 209.85.214.174 is a google IP and is authorized to use gmail in the SMTP.mailfrom / return path / envelope from.

    dkim=pass header.d=gmail.com: Says that the DKIM signature validated and the signing entity (d=) is gmail.com.

    Source:
    http://blog.wordtothewise.com/
     

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