Lemlist Phone & Email Validation Integration
Validate phone and email data automatically across Lemlist, so your team works from clean, verified records.
The 1Lookup Lemlist integration validates phone numbers and verifies emails inside Lemlist. When a record is created or updated, 1Lookup checks the number's line type and carrier and the email's deliverability, then writes the result back so your team works Lemlist from clean, reachable contacts instead of guesswork.
Why validate Lemlist data with 1Lookup
Outbound motion in Lemlist depends on reaching real people. Bad numbers and dead emails burn rep hours and hurt deliverability. 1Lookup validates each contact so your Lemlist sequences only target reachable phones and deliverable inboxes.
Push validated fields back into Lemlist to prioritise reachable mobile numbers for SMS and calls, suppress disposable or role-based emails, and protect domain reputation as you scale outreach.
What you can do
Phone validation
Confirm a number is real and see its line type and carrier inside Lemlist.
Email verification
Check deliverability and flag disposable and role-based addresses in Lemlist.
Risk & spam signals
Surface spam-reported and high-risk numbers so Lemlist records can be screened.
Bulk clean-up
Validate the contacts already in Lemlist in bulk, not just new ones.
How to connect 1Lookup to Lemlist
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.
Add a webhook/HTTP step in Lemlist
In your Lemlist workflow, add a webhook or HTTP action that calls the 1Lookup API with the phone, email, or IP.
Parse the response
Map the returned fields (line type, carrier, deliverability, and IP risk) into Lemlist.
Act on the result
Use the parsed values in Lemlist to route, tag, or suppress records based on validity.
Use cases
Higher connect rates
Route only valid mobile lines from Lemlist to dialers and SMS, lifting the share of attempts that connect.
Protected deliverability
Filter disposable and role-based emails before Lemlist sends, keeping bounce rates and spam complaints down.
Frequently asked questions
What does 1Lookup validate for Lemlist?
1Lookup validates phone and email data. For phone numbers it returns validity, line type, and carrier; for emails it returns deliverability and detects disposable and role-based addresses. You choose which fields to store in Lemlist.
Do I need to write code to use 1Lookup with Lemlist?
Minimal code: a webhook or HTTP step in Lemlist calls the 1Lookup API, with light configuration to map the response.
Can I validate records I already have in Lemlist?
Yes. Alongside real-time validation, you can run existing Lemlist 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.