n8n Email Automation: Sequences, Triggers, and Smart Follow-Ups

Email is still the highest ROI marketing and sales channel. Automating email with n8n means you can trigger personalised messages at exactly the right moment, process inbound emails with AI, manage sequences automatically, and connect email to the rest of your business stack. This guide covers every major email automation pattern in n8n.

MJK Supplies · May 31, 2026 · 10 min read

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n8n Email Automation: Sequences, Triggers, and Smart Follow-Ups

Email Automation Foundations

n8n supports all major email platforms via native nodes:

Outbound email sending:

Gmail (via Google node)
Outlook/Microsoft 365 (via Microsoft node)
SMTP (generic; works with any email provider)
SendGrid (native node; best for bulk/transactional)
Mailchimp (native node; marketing automation)
Brevo/Sendinblue (native node)

Inbound email processing:

Gmail trigger (new email received)
IMAP trigger (works with any email provider)
Email Parser (extract data from structured emails)

Inbound Email Processing

Processing inbound email is where AI changes everything:

Basic pattern: Gmail trigger → Claude (classify + analyse) → branch (route based on classification) → action

Classification workflow:

// Claude API call { "model": "claude-sonnet-4-6", "max_tokens": 512, "system": "Classify this email into exactly one category: support, sales_inquiry, billing, partnership, spam. Return JSON only: {\"category\": \"...\", \"urgency\": \"high|medium|low\", \"summary\": \"one sentence\"}", "messages": [{ "role": "user", "content": "Subject: {{ $json.subject }}\n\nBody: {{ $json.body }}" }] }

Then use IF/Switch nodes to route:

support → create Zendesk ticket
sales_inquiry → create HubSpot deal + notify sales rep
billing → create billing task + customer lookup
spam → archive

Automated Email Responses

Not every email should be manually responded to. Automate responses for:

FAQ responses:

Gmail trigger: new support email
Claude: "Does this email contain a question about [specific topic]? If yes, answer from this knowledge base. If no, return 'NEEDS_HUMAN'."
IF: if response ≠ NEEDS_HUMAN → Gmail draft response
ELSE → Route to support team with Claude's suggested response

Lead acknowledgement:

Inbound lead form → email notification
Claude: generate personalised response referencing their specific inquiry
Gmail: send immediate acknowledgement email
HubSpot: create contact + deal

Appointment confirmation:

Calendly webhook (booking made)
Claude: generate personalised confirmation including relevant preparation tips
Gmail: send confirmation
Calendar: create internal reminder

Cold Email Sequences

Build outbound email sequences that run automatically:

Sequence architecture:

Airtable row created (new lead) → trigger n8n
Claude: generate personalised email 1 from lead data
Gmail: send email 1
Wait 72 hours
Check: has lead replied? (Gmail search for thread)
If replied: remove from sequence + notify rep
If no reply: Claude generates email 2 (different angle)
Gmail: send email 2
Wait 7 days → email 3 → wait 14 days → email 4 (break-up email)

The reply check in n8n:

// Code node — check for reply const threadId = $node["Send Email 1"].json.threadId; // Use Gmail API to search for replies to this thread // If reply found, return reply:true, else reply:false

Transactional Email Automation

For SaaS products, trigger emails based on user behavior:

Trial activation email: Webhook (user signs up) → Wait 5 minutes → Claude (personalise onboarding email based on role/industry from signup form) → SendGrid → track open

Usage threshold alert: Daily trigger → Database (check usage metrics) → Filter (users approaching limit) → Claude (personalise upgrade nudge based on their usage patterns) → SendGrid

Re-engagement campaign: Weekly trigger → Database (users inactive >14 days) → Claude (generate re-engagement message mentioning features they used most) → Email → Track response