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Subdomain strategy, done right
Your main domain is sacred. Cold goes on a subdomain or look-alike.
Why not main domain
Cold complaints poison your transactional inbox forever.
Subdomain vs look-alike
Subdomain shares reputation. Look-alike (try-yourbrand.com) is fully isolated.
DNS setup
Separate SPF, DKIM, and ideally DMARC.
Tracking subdomain
Set up a custom open-tracking domain too.
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