Guides
The reference covers each endpoint. Guides cover jobs that span several, where order matters as much as payloads.
Migrate a list
Move an audience off Resend, Mailchimp, Kit or anything else: suppressions first, contacts in batches, then a careful first send. Includes the five things that go wrong on import and a working chunked-import script.
Elsewhere
Not everything is API-shaped. These live on the main site:
| Topic | Where |
|---|---|
| SPF, DKIM and DMARC, with the actual records | day3.app/blog/spf-dkim-dmarc-explained |
| What RFC 8058 one-click unsubscribe requires | day3.app/blog/one-click-unsubscribe-rfc-8058 |
| Transactional and marketing mail on one domain | day3.app/blog/transactional-and-marketing-one-domain |
| Double opt-in and the GDPR | day3.app/blog/gdpr-double-opt-in |
| Deliverability, end to end | day3.app/deliverability |
Missing a guide? The reference plus Conventions is usually enough to write it yourself. Conventions is the page people skip and then need.
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