# Mail List Shield, free: Email verification API

> Email validation simplified. Upload your list or automate validation

Mail List Shield's email verification API on its Free trial plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Company.
We haven't run Mail List Shield through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 3,753 plans for email verification APIs by price. Half the plans cost $1.98 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.
[MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt), [Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/499-monthly/llms.txt) and [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/mail-list-shield/free
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://maillistshield.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://maillistshield.com/api/validate-email`
- API key: with the plan, on https://maillistshield.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://documenter.getpostman.com/view/39218943/2sB3QDxDUr?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#66077f22-ed5b-49c0-928b-67f285181c72
- Sold by: Mail List Shield (https://maillistshield.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Email validation simplified. Upload your list or automate validation

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: a limited, non-exclusive, non-transferable, and revocable license to use the Services for their intended purpose [...] use the Services only for lawful purposes and in accordance with these Terms [...] You shall not: a) Use the Services in any manner that could damage, disable, overburden, or impair our servers or networks. b) Attempt to gain unauthorized access to any part of the Services. c) Use any robot, spider, or other automatic device to access the Services. d) Transmit any viruses, malware, or other harmful computer code.

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 calls, once

## Rate limit

- Per second: 0.056
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email. Optional: single_level_response
- Method: POST
- Path: /api/validate-email

## About the plan

- Plan: Free trial
- Who can get it: anyone

## The 29 fields the plan's answer can hold

message, request status, email address, status, status detail, email provider, email security gateway, disposable, free provider, MX records, catch-all, role, valid syntax, spam trap, mailbox full, alias, account, account without alias, email address without alias, FQDN, subdomain, domain, TLD, domain age, SMTP provider host, SMTP provider host domain, SMTP provider host TLD, SMTP provider IP, SMTP provider IP PTR

## Mail List Shield's plans (3)

- [Mail List Shield, free](https://datacircle.dev/validate-email-apis/mail-list-shield/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [Mail List Shield, top-up](https://datacircle.dev/validate-email-apis/mail-list-shield/top-up/llms.txt): $10.00 per 1,000, 50% complete, live
- [Mail List Shield, contact us](https://datacircle.dev/validate-email-apis/mail-list-shield/contact-us/llms.txt): 50% complete, live

## Mail List Shield's calls (1)

- `POST /api/validate-email`: [Mail List Shield, free](https://datacircle.dev/validate-email-apis/mail-list-shield/free/llms.txt)

## Mail List Shield's APIs (1)

- [Mail List Shield: email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/mail-list-shield/free/llms.txt)

## Mail List Shield: email verification API alternatives

- [Clearout, $1,000 pack, 500,000 credits, POST /email_verify/instant, Instant Verify, full](https://datacircle.dev/validate-email-apis/clearout/1000-pack-500000-credits-post-email-verify-instant-instant-verify-full/llms.txt): $10.00 per 1,000, 50% complete, live
- [MailerCheck, top-up from $10, Pay as you go, 1,000 credits, POST /check/single](https://datacircle.dev/validate-email-apis/mailercheck/top-up-from-10-pay-as-you-go-1000-credits-post-check-single/llms.txt): $10.00 per 1,000, 17% complete, live
- [CheckMail1, $1 pack, Trial, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/1-pack-trial-post-verify-batch/llms.txt): $10.00 per 1,000, 50% complete, live
- [Bytemine, $1,000 monthly, Business, POST /emails/verify/single](https://datacircle.dev/validate-email-apis/bytemine/1000-monthly-business-post-emails-verify-single/llms.txt): $10.00 per 1,000, 33% complete, live
- [Amazon SES, pay as you go](https://datacircle.dev/validate-email-apis/amazon-ses/pay-as-you-go/llms.txt): $10.00 per 1,000, 33% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-05.

- https://documenter.getpostman.com/view/39218943/2sB3QDxDUr?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://documenter.gw.postman.com/api/collections/39218943/2sB3QDxDUr?segregateAuth=true&versionTag=latest&utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://maillistshield.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://maillistshield.com/documentation/user?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://maillistshield.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://maillistshield.com/privacy-policy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://maillistshield.com/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing