SendGrid SMTP API

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SendGrid SMTP API

Disclaimer: I work at SendGrid.

Our SMTP API example recommends using the Swift_SmtpTransport library, which makes low-level socket connections to end systems. When configured with our example, Swift connects to our systems to deliver your message, and won't require an SMTP service on your end.

To integrate with SendGrid's SMTP API:

  1. Create an API Key with at least "Mail" permissions.
  2. Set the server host in your email client or application to smtp.sendgrid.net. This setting is sometimes referred to as the external SMTP server or the SMTP relay.
  3. Set your username to the string apikey. This setting is the exact string "apikey" and not the API key itself.
  4. Set your password to the API key generated in step one.
  5. Set the port to 587 (or as specified below).

When submitting base64 encoded API key values, be sure you have not included any newline or whitespace characters by accident. This can happen when copying the encoded key from an environment that line wraps output. SMTP is a line-oriented protocol, and linefeed characters will prevent you from authenticating successfully.

SMTP ports

If you are unsure which port to use, a TLS connection on port 587 is typically recommended. To better understand the difference between ports 465 and 587, see the Twilio SendGrid blog post, "What's the Difference Between Ports 465 and 587".

Build SMTP email

Now that you've integrated, learn to build SMTP email.

Rate limits

  • You may send up to 5k messages per SMTP connection.
  • You may open up to 10k concurrent connections from a single server.

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