Understand
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In short
How do the mechanisms behind outbound outreach actually work?
This section explains the machinery underneath outbound — how mailbox providers score senders, why warm-up exists, what SPF, DKIM, and DMARC actually verify, how sequence cadence affects results, and what an AI SDR really automates. Every page is written to be true even without Reply, then links to how Reply implements it.
These pages explain mechanisms, not features. Each one answers a "how does X actually work" question in product-neutral terms first, and only then links to the Reply implementation. If you want product behavior directly, go to Capabilities or Behavior.
Deliverability mechanics
Email deliverability
What decides whether a message lands in the inbox, spam, or nowhere
Sender reputation
The score mailbox providers keep on every sending identity
Email warm-up
Why new mailboxes must earn volume gradually
SPF, DKIM, DMARC
What the three authentication records actually verify
Outreach and AI
Sequence design
Cadence theory: steps, spacing, and channels that get answers
Multichannel strategy
Why channels compound instead of just adding up
The AI SDR model
Autonomy levels, what AI actually automates, and honest limits
Reply classification
How incoming replies are sorted into intents, and why it is hard
How these pages are written
Every explainer follows the same shape: what the mechanism is, why it works that way, how it behaves in practice, common misconceptions, how Reply implements it, and where the mechanism itself breaks down. The product enters only in the second half — the first half stays true even if you never use Reply.
Related
- Capabilities — can Reply do X?
- Behavior — the deterministic product logic
- Playbooks — applied recipes for specific situations