Build SendGrid X-SMTPAPI headers in PHP.

0.6.5 2020-03-04 22:03 UTC

This package is auto-updated.

Last update: 2020-05-29 15:05:00 UTC


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This module helps build Twilio SendGrid's SMTP API headers.

Learn more about the SMTP API at Twilio SendGrid's documentation.


All updates to this module is documented in our CHANGELOG.

Table of Contents



  • PHP version 5.6, 7.0, 7.1, 7.2, 7.3, or 7.4
  • The Twilio SendGrid service, starting at the free level

Install with Composer

The following recommended installation requires composer.

Add the following to your composer.json file.

    "require": {
        "sendgrid/smtpapi": "^0.6.5"

Then at the top of your script require the autoloader:

require 'vendor/autoload.php';

Alternative: Install package from zip

If you are not using Composer, simply download and install the latest packaged release of the library as a zip.

⬇︎ Download Packaged Library ⬇︎

Then require the library from package:


Previous versions of the library can be downloaded directly from GitHub.

Setup Environment Variables

Environment Variable

Update the development environment with your SENDGRID_API_KEY, for example:

echo "export SENDGRID_API_KEY='YOUR_API_KEY'" > sendgrid.env
echo "sendgrid.env" >> .gitignore
source ./sendgrid.env

Quick Start

$header = new Smtpapi\Header();
print $header->jsonString();



If you are interested in the future direction of this project, please take a look at our milestones. We would love to hear your feedback.

How to Contribute

We encourage contribution to our projects, please see our CONTRIBUTING guide for details.

Quick links:


smtpapi-php is maintained and funded by Twilio SendGrid, Inc. The names and logos for smtpapi-php are trademarks of Twilio SendGrid, Inc.

If you need help installing or using the library, please check the Twilio SendGrid Support Help Center.

If you've instead found a bug in the library or would like new features added, go ahead and open issues or pull requests against this repo!


The MIT License (MIT)