Marketing

Mailchimp

Mailchimp is the long-standing default for SMB marketing email. Authentication uses two CNAME records (k1, k2) instead of customer-managed TXT keys, plus an SPF include.

DNS records to publish

Type	Host	Value
CNAME	k1._domainkey	`dkim.mcsv.net` DKIM key 1
CNAME	k2._domainkey	`dkim2.mcsv.net` DKIM key 2

Authentication setup

SPF

Optional; Mailchimp aligns DKIM by default. Add include:servers.mcsv.net if you want SPF alignment.

DKIM

Publish the two CNAMEs Mailchimp shows in the domain authentication step.

DMARC

Standard rollout; Mailchimp aligns DKIM by default when domain authentication is set up.

Deliverability tips

Run a re-engagement campaign before importing an old list — Mailchimp's spam-trap exposure makes stale lists very expensive.
Enable Mailchimp's send-time optimisation; engagement-based send time is one of the few automation features worth the cost.
Avoid the default 'no-reply@' address: many filters down-rank it.

Mailchimp setup docs

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