H=Date:From:To:Reply-to:Subject:Sender:MIME-Version:Content-Type:List-Unsubscribe:Message-ID a=rsa-sha1 c=nofws q=dns s=default d= ī=Q5jmheGC2jWG11Vk3JlcrBeCygLWzS+H5GiRK1uJ8IBdpK5+xOWGYjHpJZCyrfl5rcD7lDIUeFYL Received: from () by with Microsoft SMTPSVC(.23008) ĭKIM-Signature: v=1 a=rsa-sha1 c=relaxed/relaxed s=default d= SMTP Server (TLS) id 15.1.231.11 via Frontend Transport Fri, discourages use of 10.173.160.30 as permitted sender) Received-SPF: SoftFail (: domain of transitioning Smtp.mailfrom= dkim=pass (signature was verified) ![]() SMTP Server (TLS) id 15.1.225.19 via Frontend Transport Fri, Īuthentication-Results: spf=softfail (sender IP is 10.173.160.30) Here is one of the headers for reference. Has anyone else had this same issue recently? ![]() Upon further inspection of the received headers I found that Hotmail was internally relaying the emails for spam checking, then trying to authenticate our SPF against their internal IP instead of the actual sending IP. Around 7/15 my company started failing SPF at Hotmail about 30% of the time.
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