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Sendcorex API

A powerful email delivery API built for developers. Send transactional emails, schedule campaigns, and track engagement, all from a single endpoint.

  • v3.0
  • REST
  • JSON
  • HMAC Webhooks
  • STARTTLS SMTP
Create API key Browse the API reference

Hosts

The API runs on three hosts, plus the SMTP relay. Each endpoint page tells you which one it uses.

Most requests

Domains, contacts, tracking, senders and the rest of the API.

https://graph.sendcorex.com/v3.0

Sending

POST /send, POST /:id/cancel, POST /quarantine/release.

https://mail.sendcorex.com/v3.0

Receiving

Read emails. Receiving endpoints use their own host.

https://g.sendcorex.com

SMTP relay

Ports 505 and 588. TLS or plain, you choose.

smtp.emailsbit.com

Send your first email in 3 steps

  1. 1

    Connect your domain

    Add DNS records to prove you own the sending domain.

    Open Domains
  2. 2

    Get your API key

    Generate a key from the dashboard and send it in the Authorization header.

    Create API key
  3. 3

    POST to /send

    Pass from, to, subject and html. That is all it takes.

    Send Email

Choose your integration

POST /sendJSON body

REST API

Needs domain

Send via API

Full control over every email. Best for transactional mail, notifications and anything your app triggers.

  • JSON request body
  • Attachments, scheduling, batch
  • Webhooks for delivery events
Get started
Port 505TLS optional

SMTP

Needs domain

Send via SMTP

Drop-in relay for existing mailers. Change your SMTP settings and keep your code as it is.

  • Works with any mailer or framework
  • Ports 505 and 588, TLS or plain
  • Same deliverability as the API
SMTP settings
Inboundg.sendcorex.com

Inbound

Needs domain

Receive emails

Read the emails that arrive on your domain, straight from your own code.

  • Read received emails over REST
  • Folders, threads, search and labels
  • Send and reply from the mailbox
Read emails
12 checks100 free

Tool

No domain

Validate emails only

Check addresses before sending. Catches bad format, invalid MX, spam traps and disposable domains.

  • Format and MX record check
  • Spam trap and disposable detection
  • No domain setup required
View endpoint

Full API reference

All endpoints, grouped by resource.