On Thu 25/Mar/2021 20:31:35 +0100 Charles Gregory wrote:
Consider how this SHOULD work with email service providers to a small
business. Emails should appear FROM CompanyA while the SENDER appears FROM
MailChimp. These are legitimately separate concerns. Bounces go back to
MailChimp for processing. The receiver sees CompanyA in the from field.
Do they trust MailChimp? If they do, let MailChimp create a DKIM key and sign
the messages they send on behalf of CompanyA as:
DKIM-Signature: v=1; d=CompanyA; s=MailChimp; ...
To publish the public key that MailChimp will hand out as said selector is
CompanyA's act of faith. Indeed, the effect is not much different than
authorizing specific domains through DNS.
Best
Ale
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