# Build a support knowledge base from historical Gmail emails: n8n workflow

> Started by an event in a connected app, and works across Gmail and Postgres. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/build-a-support-knowledge-base-from-historical-gmail-emails (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Customer support](https://millionrounds.com/workflows?category=Customer+support#library)

# Build a support knowledge base from historical Gmail emails

Started by an event in a connected app, and works across Gmail and Postgres. It hands the judgement calls to OpenAI. 16 steps, 4 branches: a working afternoon to understand properly.

Medium Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fbuild-a-support-knowledge-base-from-historical-gmail-emails)

**16 steps** Medium: a working afternoon

**4** Branches: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Model 2 Logic 10 Service 3

The steps in the order they run, from what starts it.

- 1 **Manual Trigger** Manual trigger *Starts it*
- 2 **OpenAI Chat Model** Lm Chat Open Ai *Model*
- 3 **Fetch Emails** Gmail *Service*
- 4 **AI Extract KB Entries** Agent *Model*
- 5 **Parse and Filter** Code *Logic*
- 6 **Parse KB Entries** Code *Logic*
- 7 **Is Customer Email** If *Logic*
- 8 **Has KB Entries** If *Logic*
- 9 **Check Duplicate in DB** Postgres *Service*
- 10 **Check KB Duplicate** Postgres *Service*
- 11 **Merge Duplicate Result** Code *Logic*
- 12 **Merge KB Duplicate Result** Code *Logic*
- 13 **Not Already Processed** If *Logic*
- 14 **KB Entry Is New** If *Logic*
- 15 **Assemble Thread** Code *Logic*
- 16 **Process and Insert All** Code *Logic*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 16, with 4 branches
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Postgres
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Gmail and Postgres accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 16 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 16 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fbuild-a-support-knowledge-base-from-historical-gmail-emails)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Postgres](https://millionrounds.com/workflows?service=Postgres#library)

## Workflows like it

Also customer support, with the same services where possible, closest in size first.

- [**Answer customer questions and book jobs with OpenAI RAG** 16 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/answer-customer-questions-and-book-jobs-with-openai-rag-2)
- [**Answer customer questions and book jobs with OpenAI RAG** 16 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/answer-customer-questions-and-book-jobs-with-openai-rag)
- [**Automate IT support: Convert emails to Jira tickets** 16 steps · calls a model · Gmail, Jira](https://millionrounds.com/workflow/automate-it-support-convert-emails-to-jira-tickets)
- [**Automated customer support with OpenAI** 16 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/automated-customer-support-with-openai)
- [**Book beauty appointments and answer FAQs with OpenAI** 16 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/book-beauty-appointments-and-answer-faqs-with-openai)
- [**Classify Gmail support emails with a local model and Postgres** 16 steps · calls a model · Gmail, Postgres](https://millionrounds.com/workflow/classify-gmail-support-emails-with-a-local-model-and-postgre)