Catch bad emails before they bounce.
Syntax, MX records, disposable domains, mailbox verification. Built into your sending flow or available on demand via API.
Validates on send. Or on demand.
Validation that works automatically when you send, or on demand via the API and dashboard. Pay per validation with no monthly minimums.
ClaudeMCP validation
Ask your AI agent to validate emails. Sendkit's MCP server lets Claude check addresses without writing code.
Automatic suppression
Invalid and risky addresses are automatically added to your suppression list. No manual cleanup needed.
Validation analytics
Track validation history with detailed results. Search past validations and monitor your email quality over time.
Six checks before every email
Every email is checked against multiple signals to give you a clear deliverability verdict. Catch bad addresses before they damage your sender reputation.
Syntax validation
RFC-compliant format checking. Catches typos, missing domains, and malformed addresses before they cause bounces.
MX record verification
DNS lookup to confirm the domain has valid mail exchange records and can actually receive email. Eliminates hard bounces from non-existent domains.
Disposable email detection
Identify temporary and throwaway email addresses from services like Guerrilla Mail and Temp Mail. Block fake signups at the source.
Mailbox verification
Verify that the specific mailbox exists on the mail server. Goes beyond domain checks to confirm the actual recipient address is deliverable.
Role-based detection
Flag shared mailboxes like info@, support@, and admin@. These addresses often have lower engagement and higher complaint rates.
Random input detection
Detect randomly generated local parts like "asdf@" or "qwerty@". Identify keyboard-mash entries from users trying to bypass forms.
What our customers are saying
See how developers, marketers, and product teams use Sendkit to send emails that reach the inbox.
Our old email API kept throttling us during peak hours. Moved to Sendkit and the rate limits are way more generous. Transactional email deliverability went from "okay" to basically perfect.
Sarah Mitchell
CTO at Nuvora
Migrating our SMTP relay took maybe 20 minutes. Changed the host, dropped in the API key, done. Bounce handling and suppression lists just work out of the box, which was a nice surprise.
Jake Brennan
Backend Lead at Contal
I run all our drip campaigns and the weekly newsletter through Sendkit. The email automation triggers are flexible enough that I stopped asking engineering for help months ago.
Lisa Nguyen
Head of Growth at Aumi
We send around 400K transactional emails a month. No per-contact pricing was the main reason we switched. The webhook events for deliveries, opens, and bounces are reliable and fast.
Ryan Cole
Lead Engineer at Pago
We were using one tool for transactional email and another for marketing. Sendkit replaced both. Password resets, order confirmations, newsletters, all from one API. Simpler billing too.
Meg Anderson
Co-founder at Kivo
The email validation API catches bad addresses before we even try to send. Our bounce rate dropped hard after we added it to the signup flow. The MCP integration with Claude is a bonus.
Dan Kirby
Fullstack Dev at Vesti
Start sending in minutes.
3,000 emails/month on the free tier. No credit card, no commitment.