Sender ID is the method Microsoft has recently started using to check whether an email is actually coming from the company the message headers say it is coming from. Sender ID is actually a combination of SPF (Sender Protection Framework) and Microsoft's proprietary anti-spoofing technology.
v=spf1 mx a:mail.example.com ip4:216.27.9.96/29 include:icpbounce.com ?all
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