# MailSlurp, free: Email verification API

> Verify a list of email addresses is valid and can be contacted.

MailSlurp's email verification API on its Free plan. It costs $0.00 per 1,000 emails. MailSlurp's docs list 1 of the 6 key fields we check: Deliverability.
We haven't run MailSlurp through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 3,952 plans for email verification APIs by price. Half the plans cost $1.999 per 1,000 emails or less.
[treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers.
[Disify's $9 monthly plan (/email)](https://datacircle.dev/validate-email-apis/disify/9-monthly-starter-post-email/llms.txt) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.
[pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt), [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) and [Giggal](https://datacircle.dev/validate-email-apis/giggal/39-pack-50000-credits-post-v1-verify/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/mailslurp/free
- [Email validation API: 200+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://app.mailslurp.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.mailslurp.com/email-verification/email-address-list`
- API key: with the plan, on https://app.mailslurp.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://docs.mailslurp.com/api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#validateEmailAddressList
- Sold by: MailSlurp (https://www.mailslurp.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

- $ per 1,000 emails: $0.00
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Create an inbox email address: 100 inboxes a month

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Verify a list of email addresses is valid and can be contacted.

## Data

- Keep data: no limit
- Use data: You must not, directly or indirectly: use the Services for unsolicited communications, spam, or mass messaging in violation of applicable law [...] resell, sublicense, or make the Services available to third parties except as expressly permitted [...] use the Services or any data obtained from the Services to train, retrain, or improve any machine learning models or artificial intelligence systems (including large language models) without MailSlurp's express prior written consent.

## Plan

- Pay: $0

## Rate limit

- Per second: 150

## Speed

- Answer: in the call

## The call

- You send: emailAddressList. Optional: ignoreOldResults
- Method: POST
- Path: /email-verification/email-address-list

## About the plan

- Plan: Free
- Who can get it: anyone, 1 user, no card needed

## The 3 fields the plan's answer can hold

valid email addresses, invalid email addresses, validity by email address

## MailSlurp's plans (5)

- [MailSlurp, free](https://datacircle.dev/validate-email-apis/mailslurp/free/llms.txt): $0.00 per 1,000, 17% complete
- [MailSlurp, $19.99 monthly](https://datacircle.dev/validate-email-apis/mailslurp/19-99-monthly/llms.txt): 17% complete
- [MailSlurp, $69 monthly](https://datacircle.dev/validate-email-apis/mailslurp/69-monthly/llms.txt): 17% complete
- [MailSlurp, $199 monthly](https://datacircle.dev/validate-email-apis/mailslurp/199-monthly/llms.txt): 17% complete
- [MailSlurp, contact us](https://datacircle.dev/validate-email-apis/mailslurp/contact-us/llms.txt): 17% complete

## MailSlurp's calls for this API (1)

- `POST /email-verification/email-address-list`: [MailSlurp, free](https://datacircle.dev/validate-email-apis/mailslurp/free/llms.txt)

## MailSlurp's APIs (2)

- [MailSlurp: email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/mailslurp/free/llms.txt)
- [MailSlurp: phone validation API pricing, 5 plans](https://datacircle.dev/validate-phone-apis/mailslurp/free/llms.txt)

## MailSlurp: email verification API alternatives

- [pingutil, free API key, POST /v1/verify](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt): $0.00 per 1,000, 50% complete, 30 days
- [MailTester Ninja, free, No token](https://datacircle.dev/validate-email-apis/mailtester-ninja/free-no-token/llms.txt): $0.00 per 1,000, 50% complete, live
- [Giggal, free trial, POST /v1/verify-batch](https://datacircle.dev/validate-email-apis/giggal/free-trial-post-v1-verify-batch/llms.txt): $0.00 per 1,000, 67% complete, live
- [Enrich.so, free, POST /email-validation](https://datacircle.dev/validate-email-apis/enrich-so/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [IsValid, free](https://datacircle.dev/validate-email-apis/isvalid/free/llms.txt): $0.00 per 1,000, 50% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-06.

- https://api.mailslurp.com/v2/api-docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://app.mailslurp.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.mailslurp.com/api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.mailslurp.com/guides/avoiding-api-rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.mailslurp.com/terms-and-conditions/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing