AI-native email validation
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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.
We needed something simple for onboarding emails. The MCP integration is what got us, we connected it to Claude and had our whole email sequence done in maybe 15 minutes. Looked around before and couldn't find that anywhere else.
Pedro Campos
Founder at SupapinMigrating our SMTP relay took maybe 20 minutes. Swapped the host, dropped in the API key, done. Bounce handling and suppression lists just work. We had a whole week blocked for that and didn't need any of it.
Paulo Castellano
Founder at ChangelogfyWe use Sendkit for appointment reminders, post-treatment follow-ups, stuff like that. Set up all the automations myself in one sitting, no developer needed. Our clients actually started rebooking more once we stopped forgetting to follow up.
Patrick Silva
Founder at BellacorpoStart sending in minutes.
3,000 emails/month on the free tier. No credit card, no commitment.
Still wondering?
See what your favorite LLM has to say about us, then make an informed decision.
