Email marketing automation with AI follow-up and human handoff

A follow-up system that keeps each lead's email conversation in context and brings in a person when judgement is needed.

The problem

Following up consistently with many inbound leads by email is hard at scale. Tracking the context of each conversation by hand, across many threads at once, needs someone watching every one.

How the system works

Data model

Five tables hold leads, contacts, conversations, messages and events separately. This keeps the full interaction history instead of just recording whether an email was sent.

First touch

A new prospect automatically receives an opening message when they enter the system.

Inbound handling

Replies arrive by webhook, are matched to the right conversation thread and stored as further messages in it.

AI summarisation

An AI agent periodically condenses long threads so a human reviewer can grasp the context without reading the whole exchange.

Automated follow-up

When a lead stays silent past a set time, the system writes and sends a suitable follow-up that keeps the conversation natural.

Human handoff

Conversations that need judgement, such as complex questions or sales-ready leads, are flagged and passed to a team member. Resolved conversations stop receiving automated messages.

Result in production

Every lead gets timely, contextual follow-up without a person tracking each conversation manually, and a human is brought in exactly when needed.

Who this pattern fits

We built it for sales and marketing, but the approach fits any department managing similar volumes and coordination. The stack runs independently, is stable and suits small teams without dedicated platform engineers.

Tools used

n8n

Workflow runtime and orchestration; every scheduled job, webhook and branch lives here.

Unipile

Handles the sending of messages in production.

Supabase

PostgreSQL database, authentication and storage as the authoritative record.

Claude API

Reasoning and structured outputs; our default model for anything that has to be trusted.

Frequently asked questions

Does this work with any email provider?

Yes. Unipile handles the sending, while the data model and the logic around it do not depend on a particular provider.