# MailSift, free, Free, POST /verify/batch, Verify up to 100 emails at once: Email validation API

> MailSift is a fast, accurate email verification API and bulk CSV validator. It detects invalid, disposable, role-based, and risky email addresses using syntax, MX, SPF, DMARC, SMTP, and catch-all checks, returning a status and a 0–100 deliverability score.

MailSift's email validation API on its Free plan, $0.00 per 1,000 emails. 4 of the 6 key fields: Address, Its check, Confidence, Company.

- This page: https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-batch-verify-up-to-100-emails-at-once
- Get it: https://mailsift.dev/pricing
- Its API docs: https://mailsift.dev/api#endpoints
- Sold by: MailSift (https://mailsift.dev)
- Checked: 2026-10-20

## In the answer

- Completeness: 67%
- Address: ✓
- Its check: ✓
- Confidence: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Per: result
- Also pays for: from the same budget: Verify one email · Verify one email with Deep Verification · Verify up to 100 emails at once with Deep Verification · Verify a CSV in bulk · Verify a CSV in bulk with Deep Verification

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: MailSift is a fast, accurate email verification API and bulk CSV validator. It detects invalid, disposable, role-based, and risky email addresses using syntax, MX, SPF, DMARC, SMTP, and catch-all checks, returning a status and a 0–100 deliverability score.

## Data

- Freshness: live
- Keep data: no limit
- Use data: You may not use MailSift to: send unsolicited email, harass individuals, build databases of contact information for sale, circumvent rate limits or terms, or for any unlawful purpose. [...] You are responsible for having a lawful basis to process the email addresses you submit, including, where applicable, consent under the GDPR. [...] We grant you a non-transferable, revocable license to use the service for its intended purpose.

## Plan

- Pay: $0
- You get: 500 credits
- Enough for: 500 results, once
- Expires: never

## Rate limit

- Per second: 1
- Batch: 100

## Speed

- Answer: in the call

## The call

- You send: emails. Optional: mode
- Method: POST
- Path: /verify/batch

## About the plan

- Plan: Free
- Who can get it: anyone 16 or older

## The 42 fields the plan's answer can hold

email, status, sub-status, score, mode, credits used, domain, MX records, free check, response time, checked at, engine version, normalized email, typo suggestion, MX provider, domain age, blocklist listings, SPF record, DMARC record, DMARC policy, catch-all confidence, reasons, syntax valid, free provider, disposable, MX, parked, relay, SPF, DMARC, catch-all, role address, blocklisted, MX routable, forwarder, SMTPUTF8, MTA-STS, TLS-RPT, BIMI, count, truncated, error

## MailSift's plans (5)

- [MailSift, free, Free, POST /verify/batch, Verify up to 100 emails at once](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-batch-verify-up-to-100-emails-at-once/llms.txt): $0.00 per 1,000, 67% complete, live
- [MailSift, $10 pack, Starter, POST /verify/batch, Verify up to 100 emails at once](https://datacircle.dev/validate-email-apis/mailsift/10-pack-starter-post-verify-batch-verify-up-to-100-emails-at-once/llms.txt): $0.40 per 1,000, 67% complete, live
- [MailSift, $35 pack, Growth, POST /verify/batch, Verify up to 100 emails at once](https://datacircle.dev/validate-email-apis/mailsift/35-pack-growth-post-verify-batch-verify-up-to-100-emails-at-once/llms.txt): $0.35 per 1,000, 67% complete, live
- [MailSift, $99 pack, Pro, POST /verify/batch, Verify up to 100 emails at once](https://datacircle.dev/validate-email-apis/mailsift/99-pack-pro-post-verify-batch-verify-up-to-100-emails-at-once/llms.txt): $0.283 per 1,000, 67% complete, live
- [MailSift, $249 pack, Enterprise, POST /verify/batch, Verify up to 100 emails at once](https://datacircle.dev/validate-email-apis/mailsift/249-pack-enterprise-post-verify-batch-verify-up-to-100-emails-at-once/llms.txt): $0.249 per 1,000, 67% complete, live

## MailSift's calls (6)

- `POST /verify/bulk`, Verify a CSV in bulk: [MailSift, free, Free, POST /verify/bulk, Verify a CSV in bulk](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-bulk-verify-a-csv-in-bulk/llms.txt)
- `POST /verify/bulk`, Verify a CSV in bulk with Deep Verification: [MailSift, free, Free, POST /verify/bulk, Verify a CSV in bulk with Deep Verification](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-bulk-verify-a-csv-in-bulk-with-deep-verification/llms.txt)
- `GET /verify`, Verify one email: [MailSift, free, Free, GET /verify, Verify one email](https://datacircle.dev/validate-email-apis/mailsift/free-free-get-verify-verify-one-email/llms.txt)
- `GET /verify`, Verify one email with Deep Verification: [MailSift, free, Free, GET /verify, Verify one email with Deep Verification](https://datacircle.dev/validate-email-apis/mailsift/free-free-get-verify-verify-one-email-with-deep-verification/llms.txt)
- `POST /verify/batch`, Verify up to 100 emails at once: [MailSift, free, Free, POST /verify/batch, Verify up to 100 emails at once](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-batch-verify-up-to-100-emails-at-once/llms.txt)
- `POST /verify/batch`, Verify up to 100 emails at once with Deep Verification: [MailSift, free, Free, POST /verify/batch, Verify up to 100 emails at once with Deep Verification](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-batch-verify-up-to-100-emails-at-once-with-deep-verification/llms.txt)

## Similar plans of other providers

- [Melissa, free, Monthly Top-off, GET /V4/WEB/GlobalEmail/doGlobalEmail](https://datacircle.dev/validate-email-apis/melissa/free-monthly-top-off-get-v4-web-globalemail-doglobalemail/llms.txt): $0.00 per 1,000, 50% complete, live
- [Minelead, free](https://datacircle.dev/validate-email-apis/minelead/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [MailValidation.io, free, Free, POST /api/validate/](https://datacircle.dev/validate-email-apis/mailvalidation-io/free-free-post-api-validate/llms.txt): $0.00 per 1,000, 33% complete, live
- [MyEmailVerifier, free, 100 free credits daily, GET /verifier/validate_single/{email}/{API_KEY}](https://datacircle.dev/validate-email-apis/myemailverifier/free-100-free-credits-daily-get-verifier-validate-single-email-api-key/llms.txt): $0.00 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 2026-10-20.

- https://mailsift.dev
- https://mailsift.dev/api
- https://mailsift.dev/docs/api-reference.md
- https://mailsift.dev/docs/overview.md
- https://mailsift.dev/llms.txt
- https://mailsift.dev/openapi.json
- https://mailsift.dev/pricing
- https://mailsift.dev/terms