This article provides a complete, practical walkthrough of the Slack Hubspot Send Triggered n8n agent. It connects HTTP Request, Webhook across approximately 1 node(s). Expect a Intermediate setup in 15-45 minutes. One‑time purchase: €29.

What This Agent Does

This agent orchestrates a reliable automation between HTTP Request, Webhook, handling triggers, data enrichment, and delivery with guardrails for errors and rate limits.

It streamlines multi‑step processes that would otherwise require manual exports, spreadsheet cleanup, and repeated API requests. By centralizing logic in n8n, it reduces context switching, lowers error rates, and ensures consistent results across teams.

Typical outcomes include faster lead handoffs, automated notifications, accurate data synchronization, and better visibility via execution logs and optional Slack/Email alerts.

How It Works

The workflow uses standard n8n building blocks like Webhook or Schedule triggers, HTTP Request for API calls, and control nodes (IF, Merge, Set) to validate inputs, branch on conditions, and format outputs. Retries and timeouts improve resilience, while credentials keep secrets safe.

Third‑Party Integrations

• HTTP Request
• Webhook

Import and Use in n8n

1. Open n8n and create a new workflow or collection.
2. Choose Import from File or Paste JSON.
3. Paste the JSON below, then click Import.
4. Show n8n JSON

   Title:
   Automating Email Validation in HubSpot Contacts Using n8n
   
   Meta Description:
   Learn how to automate email validation of new HubSpot contacts using n8n. This workflow flags suspicious email addresses and sends real-time alerts to Slack for manual review.
   
   Keywords:
   n8n workflow, HubSpot automation, email validation, OneSimpleAPI, Slack integration, suspicious email alert, HubSpot contacts, marketing automation, lead validation, disposable email detection
   
   Third-Party APIs Used:
   
   HubSpot API: Retrieves contact data upon creation in HubSpot.
   OneSimpleAPI: Validates the deliverability, domain validity, and disposability of the email address.
   Slack API: Sends real-time alerts to a designated Slack channel when suspicious emails are detected.
   
   Article:
   
   In today’s digital sales and marketing landscape, the quality of leads entering your CRM can make or break your conversion efforts. Disposable, invalid, or otherwise suspicious email addresses can clutter your pipeline, warp analytics, and waste your team’s valuable time. With automation tools like n8n, businesses can take proactive steps to keep their contact databases clean and effective.
   
   In this article, we’ll walk through a custom n8n workflow designed to automatically validate email addresses of newly created contacts in HubSpot. If an email is deemed suspicious — either as disposable, coming from an invalid domain, or flagged for poor deliverability — a Slack notification is triggered in real time for manual review. This not only streamlines your lead qualification process but also helps maintain a high-quality contact list.
   
   How It Works: The Workflow Overview
   
   This n8n workflow consists of five core steps, utilizing three third-party services: HubSpot, OneSimpleAPI, and Slack. Here’s a breakdown of how it works:
   
   1. Trigger: When a New Contact Is Created in HubSpot
   
   The automation starts with a HubSpot Trigger node. Whenever a new contact is created in your HubSpot CRM, the workflow is triggered to start the validation process. In n8n, this is set up using a webhook integration with HubSpot’s Developer API.
   
   2. Action: Get the Contact’s Email Address
   
   Once triggered, the next step is to extract the email address of the new contact. This is achieved through a HubSpot node configured to collect the "email" property of the contact, using the standard HubSpot API credentials.
   
   3. Action: Validate the Email Using OneSimpleAPI
   
   After retrieving the email, it’s passed to OneSimpleAPI’s email validation endpoint. OneSimpleAPI checks several factors to determine the authenticity and quality of the email address, such as:
   
   - Deliverability: Whether the email server is accepting messages.
   - Domain Validity: If the domain exists and has valid DNS settings.
   - Email Disposability: If the email is a temporary/disposable address (e.g., Mailinator or 10MinuteMail).
   
   4. Decision: Is the Email Suspicious?
   
   An If node evaluates the results of the OneSimpleAPI response. Specifically, the email is flagged as suspicious if any of the following are true:
   
   - Deliverability is not marked as “GOOD”
   - The domain is not valid
   - The email is classified as disposable
   
   The conditions are evaluated with an OR logic, meaning if any one of these evaluations fails, the contact is considered suspicious.
   
   5. Action: Send a Slack Notification
   
   If any red flags are raised, a real-time alert is sent to the #hubspot-alerts channel in Slack. The notification includes:
   
   - Contact’s name
   - Suspicious email address
   - The user who created the contact in HubSpot
   
   This enables your marketing or sales team to review the contact manually and decide on the next best action.
   
   Why This Matters
   
   Poor-quality data can be extremely costly for organizations, especially those whose sales and marketing workflows heavily depend on automation. A clean email list improves:
   
   - Email deliverability
   - Campaign performance
   - ROI from CRM and marketing tools
   - Sales conversion rates
   
   By using this automation, you’re enabling your team to react faster and make data-driven decisions — without having to manually sift through each new contact.
   
   Customizing the Workflow
   
   This n8n workflow is entirely customizable based on your business logic. For example, you can:
   
   - Add logic to mark the contact as "unqualified" directly in HubSpot
   - Set up automated workflows to delete disposable contacts from the CRM
   - Route different types of alerts to different Slack channels based on internal org structure
   - Schedule a weekly report summarizing all suspicious contacts
   
   Conclusion
   
   This n8n workflow provides a practical and effective way to ensure only high-quality leads funnel into your CRM system. Automating email validation at the point of contact creation cuts down manual oversight, reduces the risk of poor-quality lead data, and empowers your teams with actionable alerts. With integrations across HubSpot, OneSimpleAPI, and Slack, you're taking a big step toward smarter, leaner marketing operations.
   
   Start building your automated email validation workflow today and take control of your lead pipeline — one email at a time.

5. Set credentials for each API node (keys, OAuth) in Credentials.
6. Run a test via Execute Workflow. Inspect Run Data, then adjust parameters.
7. Enable the workflow to run on schedule, webhook, or triggers as configured.

Tips: keep secrets in credentials, add retries and timeouts on HTTP nodes, implement error notifications, and paginate large API fetches.

Validation: use IF/Code nodes to sanitize inputs and guard against empty payloads.

Why Automate This with AI Agents

AI‑assisted automations offload repetitive, error‑prone tasks to a predictable workflow. Instead of manual copy‑paste and ad‑hoc scripts, your team gets a governed pipeline with versioned state, auditability, and observable runs.

n8n’s node graph makes data flow transparent while AI‑powered enrichment (classification, extraction, summarization) boosts throughput and consistency. Teams reclaim time, reduce operational costs, and standardize best practices without sacrificing flexibility.

Compared to one‑off integrations, an AI agent is easier to extend: swap APIs, add filters, or bolt on notifications without rewriting everything. You get reliability, control, and a faster path from idea to production.

Best Practices

• Credentials: restrict scopes and rotate tokens regularly.
• Resilience: configure retries, timeouts, and backoff for API nodes.
• Data Quality: validate inputs; normalize fields early to reduce downstream branching.
• Performance: batch records and paginate for large datasets.
• Observability: add failure alerts (Email/Slack) and persistent logs for auditing.
• Security: avoid sensitive data in logs; use environment variables and n8n credentials.

FAQs

Can I swap integrations later? Yes. Replace or add nodes and re‑map fields without rebuilding the whole flow.

How do I monitor failures? Use Execution logs and add notifications on the Error Trigger path.

Does it scale? Use queues, batching, and sub‑workflows to split responsibilities and control load.

Is my data safe? Keep secrets in Credentials, restrict token scopes, and review access logs.