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About using another domain for marketing email. "The best solution is to send your marketing emails from a different DKIM domain"

Does it mean to use a entirely new-domain.com or use marketing.domain.com?

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I've seen instances of using example.net instead of the primary example.com domain, but as a user I prefer subdomains. It's easier to confirm ("visually", just from the domain name) that it's actually coming from the same company and not a phishing email, for example.

Either way is fine. A subdomain is generally easier for users to grok and it looks less like a phishing attempt.

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