The Techniques Behind Mail Client Unsubscribe Links
Goolara
MARCH 11, 2020
Microsoft started offering unsubscribe and block features in Outlook as early as 2010. When the ISP displays that your domain is “via” some other domain, it generally means that you do not have your SPF records configured correctly. A few years down the road, we can see that the angst of many marketers was unfounded.
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