Guides
The reference tells you what each endpoint does. These are the jobs that cross several of them, where the order matters as much as the payloads.
Migrate a list
Moving an audience off Resend, Mailchimp, Kit or anything else. Suppressions first, then contacts in batches, then a careful first send. Includes the five things that reliably go wrong on import and a working chunked-import script.
Elsewhere
Some of what you might be looking for is not API-shaped and lives on the main site instead:
| 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 |
If a guide you want does not exist, the reference plus Conventions is usually enough to write it yourself. Conventions is the page people skip and then need.
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