Marketo Engage Email Verification Integration
Validate email data automatically across Marketo Engage, so your team works from clean, verified records.
The 1Lookup Marketo Engage integration verifies email addresses inside Marketo Engage. As contacts enter Marketo Engage, 1Lookup checks each address's deliverability and flags disposable and role-based emails, then writes the verdict back so your campaigns send to a clean, low-bounce list instead of risking your sender reputation.
Why validate Marketo Engage data with 1Lookup
Deliverability is the whole game in Marketo Engage, and it starts with the list. 1Lookup checks each email for validity and deliverability and flags disposable and role-based addresses before they ever enter a Marketo Engage send.
Validate addresses as they enter Marketo Engage and re-verify existing lists in bulk, so you suppress undeliverable contacts, protect your domain reputation, and keep inbox placement high.
What you can do
Email syntax & domain checks
Validate syntax, domain, and MX records for every address before Marketo Engage sends.
Deliverability verdict
Get a clear deliverable / undeliverable verdict so you can suppress bounces in Marketo Engage.
Disposable & role-based detection
Flag throwaway and role-based addresses (info@, sales@) entering Marketo Engage.
Bulk list cleaning
Re-verify the lists already in Marketo Engage, not just new contacts, to protect sender reputation.
How to connect 1Lookup to Marketo Engage
Create a 1Lookup account and API key
Sign up for a free 1Lookup account and generate an API key from the dashboard. Free-tier lookups let you test before rolling out.
Store the key securely
Keep the 1Lookup API key in your backend's secrets store (e.g. environment variables), not in client code.
Call the 1Lookup REST API
From your Marketo Engage workflow, send the email address to validate and read the clean JSON response.
Map and persist
Write the validated fields back into Marketo Engage for reporting and automation.
Use cases
Lower bounce rates
Verify addresses before Marketo Engage sends so undeliverable emails are suppressed and your bounce rate stays low.
Protect sender reputation
Catch disposable and role-based addresses early to keep Marketo Engage campaigns out of spam folders.
Frequently asked questions
What does 1Lookup validate for Marketo Engage?
1Lookup verifies email addresses for Marketo Engage: syntax, domain and MX checks, a clear deliverability verdict, and disposable / role-based detection. You choose which fields to store in Marketo Engage.
Do I need to write code to use 1Lookup with Marketo Engage?
Yes, this integration calls the 1Lookup REST API, so it suits developer workflows. You authenticate with an API key and map the JSON response into Marketo Engage.
Can I validate records I already have in Marketo Engage?
Yes. Alongside real-time validation, you can run existing Marketo Engage records through 1Lookup batch validation and write the cleaned results back.
How long does setup take?
Setup is quick for most teams. The exact time depends on how many fields you map and whether you validate in real time, in bulk, or both.