On 9/19/2022 8:07 AM, Alessandro Vesely via mailop wrote:
ARC is the authentication of choice in this case because, being devised for this task, it is supposedly straightforward to configure for it, whereas whitelisting after SPF or DKIM smells like a hack.
ARC is moderately complicated technology. I know it's header fields are showing up, but nothing about the state of real-world receiver-side processing.
And ARC has been around long enough that it is probably worth asking for reports on style of use and degree of efficacy.
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