How to Auto-Categorize Support Emails with AI (n8n Tutorial)
The short answer
An n8n workflow triggers on each new support email, sends it to Claude to classify the topic and urgency, then applies a Gmail label, routes urgent ones to Slack, and optionally drafts a reply. You open your inbox to messages already sorted and prioritized, so you handle the angry customer first and the FAQ last, without reading everything yourself.
Which tool should you use?
Self-host in n8n when you have ticket volume and want full control of routing and data.
- switch Tidio (Lyro) / Chatbase, you’re solo or low-volume, a docs-trained chatbot deflects FAQs with no build
- switch Intercom Fin, you’d rather pay per resolved ticket than maintain a bot
Support inboxes punish you for not reading everything: the one furious customer is buried between ten password resets. This workflow reads every incoming message for you, sorts it by what it is and how urgent it is, and surfaces the ones that actually need you now.
What this workflow does
- It triggers the moment a support email arrives.
- Claude reads it and returns a category and an urgency level.
- n8n labels the email, and pings you in Slack if it’s urgent.
- Optionally, Claude drafts a reply for you to approve.
What you’ll need
- n8n (self-hosted recommended for privacy).
- A Gmail account or shared support inbox (or Outlook/Zendesk/Help Scout).
- A Claude (Anthropic) API key.
- A Slack workspace for urgent alerts (optional but useful).
Build it step by step
Step 1, Trigger on new email
Add a Gmail Trigger watching your support inbox (or a specific label). Every new message now starts the workflow.
Step 2, Classify it with Claude
Add the Anthropic (Claude) node. The trick here is to ask for structured output so the rest of the workflow can act on it. Prompt:
Classify this support email. Return JSON only:
{ "category": one of ["billing","bug","feature_request","how_to","other"],
"urgency": one of ["low","medium","high"],
"summary": one short sentence }
Email:
From: {{ $json.from }}
Subject: {{ $json.subject }}
Body: {{ $json.text }}Now you have a clean category and urgency for every message.
Step 3, Label and route
Add a Gmail node to apply a label matching the category (so your inbox visually sorts itself). Then add an If node: when urgency is “high,” add a Slack node that posts the summary and a link to the email in your support channel. The furious customer now reaches you in seconds, not hours.
Step 4, (Optional) Draft a reply
Add a second Claude node that takes the email plus your help-doc text and drafts a response, then a Gmail node set to Create Draft. You review and send. Every reply is fast, on-brand, and never starts from scratch.
Step 5, Activate
Flip the workflow to Active. Your inbox now triages itself around the clock.
Make it yours
- Sentiment flag: ask Claude to flag angry or at-risk customers so you can step in personally.
- Auto-FAQ: for “how_to” emails, have it reply instantly with the right help-doc link.
- Weekly report: log every category to a sheet and summarize the trends each Friday.
This is the automation that makes a one-person operation feel like a support team. Want it built for your inbox and help docs, or recorded as a video? Add it to the request queue.
Frequently asked
How accurate is the AI at categorizing?
Very, for this kind of task. Sorting an email into a handful of clear buckets (billing, bug, feature request, urgent) is something modern models do reliably. Give Claude your exact categories and one example of each, and accuracy is high enough to trust for routing, you’re labeling, not making irreversible decisions.
Can it draft replies too, or only sort?
Both. Once an email is categorized, you can add a step where Claude drafts a reply using your help docs as context, and drop it into Gmail drafts for you to approve. Start with just sorting, then add drafting once you trust the labels.
Does this work with Outlook, Zendesk, or Help Scout?
Yes. Swap the Gmail trigger for the Outlook, Zendesk, or Help Scout node, the Claude classification step in the middle is identical regardless of where the emails live.
What about customer privacy?
If you self-host n8n, the workflow runs on your own server and the email content only leaves it for the AI API call you choose. For sensitive setups, that control is a key reason teams prefer self-hosted n8n over fully cloud tools.
Want this one done for you?
Get the enriched version with the importable workflow file, or have me build and hand over the whole thing, tested, with a walkthrough.