Deliverability and compliance essentials — Reputation, provider thresholds, the four legal regimes, and the unresolved warmup dispute

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This module is deliberately conceptual. Deliverability is mostly your sending platform's job — authentication, warmup mechanics, pacing — but the judgment calls stay yours: volume discipline, list quality, and reading the warning signs. Likewise the law: cold B2B email is legal in much of the world under conditions that differ sharply by country, and the universal duties (say who you are, honor opt-outs immediately, suppress permanently) are non-negotiable everywhere. Both pages hand you the canonical sources rather than paraphrasing them — mailbox-provider rules that act as de-facto law, the authentication standards, the blocklist operator's counter-view, and the regulators themselves.

The pages:

Deliverability in a nutshell — Reputation as the placement decider, Google's 0.30% complaint ceiling, and warmup as both universal practice and a Spamhaus blocklisting criterion.
Staying legal in a nutshell — The four regimes — US opt-out up to $53,088 per email, Canada consent, the UK corporate carve-out, the EU country split — and the duties that hold everywhere.

The mechanics of executing sends safely — schedules, daily volumes, rotation, pre-launch checks — are Sending operations. One live disagreement lives in this module: whether automated warmup is best practice or a policy violation. Both positions are presented with their proponents and a stated default; neither page picks a side on your behalf.

Numbers on these pages are dated, and both carry a Last verified line — provider rules and statutes move, and a stale compliance page is worse than none.