SPF Alignment failures on outbound email

Posted by Chewie8083@reddit | sysadmin | View on Reddit | 8 comments

Hi,

We are experiencing a number of DKIM/SPF Alignment failures when sending to hotmail/Outlook domains, and it's driving me insane currently.

If I look at the Header analyser in MXToolbox, it shows an SPF alignment failure for '52.101.71.109'. Our SPF Record includes spf.protection.outlook.com, which includes the IP range +ip4:52.100.0.0/15. The above IP is within this range, but we're still failing here? Our alignment in the DMARC record is relaxed for SPF and DKIM.