Email validation Illustration

Email Validation API Confirm your customer's data at the point of entry with Postcoder email validation.

Ensure data quality and create the best user experience.

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Simple and straightforward for users

The end of typing in your email address twice - simply send the input to Postcoder and the API will check to see if the email address is deliverable.

Simple and straightforward for users
Email address quality score

Email address quality score

Returns a quality score for the input address, letting you make an informed decision on what to accept.

Detects disposable email address servers and "catch all" domains.

No spam

Checks the deliverability of an email address without ever sending an email. Works completely in the background with no inconvenience to your user.

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GDPR compliant

We automatically encode your validation requests, so your customers' data is kept completely anonymous.

Email validation is GDPR compliant
One-click typo corrections

One-click typo corrections

Intelligently recognises mistakes such as and recommends possible fixes, allowing users to fix their mistake with just one click.

A simple REST API

API keys are used for authentication and results are returned in JSON and XML formats.

Developer Docs
jQuery Javascript Node P H P C Sharp
<EmailValidation xmlns:xsd="" xmlns:xsi="">
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Our web developers have found it simple to set up, and there is extremely little maintenance required in the upkeep.

Alex Woods
Digital Marketing Executive at Victorian Plumbing
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Free support

Our sales and support teams are with you every step of the way.
We listen carefully and communicate honestly.
We don't use scripts or automated call systems.
We have real people ready to help when you need it.

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Tracking usage

Understanding how your account is being used is important, so we make it easy for you. You can view usage reports, configure email alerts and check your remaining credit balance.

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Postcoder Pricing


We have payment options to suit every type of business, from pay-as-you-go credit packs to monthly plans to high volume licences.

The more lookups you buy, the lower the price per lookup.

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What our customers say

Netdespatch - A customer who uses Postcoder

"Allies help us maintain a level of service that is always there for our 120,000 business customers."

Find Me A Gift - A customer who uses Postcoder

"17% increase in conversion and a streamlined checkout process; we are delighted with the results."

Autotrader - A customer who uses Postcoder
Sky - A customer who uses Postcoder
Prezzybox - A customer who uses Postcoder

"2x faster checkout times - Postcoder has literally transformed our checkout."

KFC - A customer who uses Postcoder
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