Email Validation

Catch bad addresses before they hurt your sender reputation

Validate email addresses at signup or before a send — syntax, domain, MX and disposable-address checks in one call — to cut bounce rates and protect deliverability.

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Node.js PHP Laravel Python Ruby Go Java .NET Rust Elixir

How it works

1
Call the validate endpoint
Send a single address at signup, or a whole list before a big campaign.
2
Get a verdict in milliseconds
Deliverable, risky, or undeliverable — with the specific reason behind the score.
3
Block or flag at signup
Stop typos and disposable addresses from ever entering your contact database.
4
Bulk-validate before you send
Run an existing list through async batch validation before a large campaign send.

validate-email.sh

# Validate a single address
curl "https://api.mailcraft.host/v1/emails/[email protected]" \
  -H "Authorization: Bearer sk_live_••••••••"

# → { "valid": true,
#     "checks": { "format": true, "mx_record": true, "disposable": false } }

Format checks Live MX lookups Disposable-domain detection One call, no send required

Protect your reputation

Stop bad addresses at the door

Every hard bounce counts against you. Validation catches the ones you can predict before they ever reach the queue.

Syntax first

Malformed and mistyped addresses are rejected before any lookup happens.

Live DNS

Checks that the domain actually has mail servers to accept the message.

Disposable detection

Flags throwaway inboxes that sign up once and bounce forever.

What's included

Everything in Email Validation

Live on your account the moment you sign up — nothing to request or provision.

Syntax, domain and mailbox-existence checks

MX record verification against the live DNS

Disposable and temporary address detection

Role-account detection (info@, admin@, noreply@)

Bulk list validation as an async batch job

Real-time single-address API for signup forms

Pairs well with the rest of MailCraft

Email Validation is one piece of the stack — reach for these when you need more.

Email API

Send transactional email over a clean REST API with SDKs for ten languages.

Learn more

SMTP Relay

Point any existing mailer at MailCraft and keep every line of code you already wrote.

Learn more

Email Campaigns

Broadcast to a list or segment from the same contacts and domains you already use.

Learn more

Ready to try Email Validation?

Create a free account and send your first email — through the API, SMTP, or an MCP-connected AI agent — in minutes. No credit card required.

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