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Verify before CRM follow-up emails (CRM → Gmail)

Contacts due for a follow-up are pulled from your CRM, verified, and the deliverable ones receive the next email in the sequence via Gmail.

Get a free API keyInstall the n8n node

Why verify before the send

CRM data decays — people change jobs and addresses go dead. Continuing to email them quietly raises your bounce rate over time and erodes deliverability for everyone else in the sequence.

The workflow

Pipedrive → BillionVerify → Gmail — verification sits right before the send.

Schedule Trigger
pipedrive
Get due contacts
billionverify
Verify Email
IF deliverable
gmail
Send follow-up
pipedrive
Mark stale

Node by node

  1. 1
    Schedule TriggerTrigger· n8n

    Runs the follow-up batch on a regular cadence.

  2. 2
    Get due contactsSource· pipedrive

    Pulls contacts whose next follow-up is due from your CRM.

  3. 3
    Verify EmailVerify· billionverify

    The BillionVerify node, operation "Verify Email". Map its Email field to the address from the previous node. It returns status (valid / invalid / risky / catch-all / role / disposable), is_deliverable, a confidence score, and the reason — all before anything is sent.

  4. 4
    IF deliverableLogic· n8n

    Branches on the verification result. Condition: is_deliverable is true. The true branch continues to the send; the false branch skips the send and flags the contact.

  5. 5
    Send follow-upSend· gmail

    Sends the next sequence email via Gmail for deliverable contacts only.

  6. 6
    Mark staleLogic· pipedrive

    For the false branch: flag the contact as stale in the CRM so it stops receiving emails until re-validated.

When to use this

  • Sales sequences that nurture leads over weeks or months.
  • Account managers re-engaging dormant contacts.
  • Any recurring send where CRM data slowly goes stale.

Three ways to connect

n8n node

Install the BillionVerify community node and drop it into this workflow.

Integrately

1-Click connect BillionVerify with 1500+ apps, no code.

REST API

Call the verification API directly from any stack.

FAQ

How often should I re-verify CRM contacts?

Verifying right before each send is ideal. For large bases, also run a periodic bulk cleanup to catch decay between sends.

Which CRMs are supported?

Any with an n8n node — Pipedrive, HubSpot, Salesforce, Zoho and more. Swap the source node; the gate stays the same.

Does flagging stale contacts hurt my data?

No — it improves it. Stale flags keep dead addresses out of future sends and give you a re-validation queue.

Add verification to your workflow

Create a free account, grab your API key, and stop bounces before they happen.

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