Module 04: The Email Engine

Anchor outcome Email open rate 47% above industry average. Lead response time reduced to under 4 minutes for the first automated touchpoint.

Era 3 built the sending infrastructure with verified deliverability, seven purpose-built notification modules, nurture sequences that branch based on lead behavior, and an inbound listener that routes replies back into the CRM. After this era, every lead received the right email at the right time. No manual sending. The sales team focused on leads that engaged; the system handled everyone else.

The 4 lessons

Lesson 4.1

Deliverability Fundamentals: SPF, DKIM, DMARC, and Why Your Emails Are in Spam

The DNS records that prove you're authorized to send, a dedicated sending domain to isolate reputation, the IP warm-up schedule, and bounce handling via webhook. Everything that has to be true before the first template fires.

Lesson 4.2

7 Email Modules: One Template Per Lead Context

The module pattern (consistent function signature, suppression check, CRM logging), the seven contexts from unit inquiry to credit application, template rendering with output buffering, and the credit app double-notify pattern.

Lesson 4.3

Nurture Sequences with Conditional Branching

Sequence enrollment on lead creation, step execution with status checks at fire time (not enrollment time), the cron pattern with wp_schedule_single_event(), and unenrollment when a lead closes.

Lesson 4.4

The Inbound Listener: When Leads Reply

Brevo inbound parsing to a WordPress REST endpoint, matching replies to existing lead records by email, logging to the conversation table, automatic status updates, and creating new leads from cold inbound email.