Build SendGrid X-SMTPAPI headers in PHP.

0.6.1 2017-07-06 22:11 UTC


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This module helps build SendGrid's SMTP API headers.

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


All updates to this module is documented in our CHANGELOG.

Table of Contents



  • PHP version 5.6 or 7.0
  • The SendGrid service, starting at the free level

Install with Composer

The following recommended installation requires

Add the following to your composer.json file.

    "require": {
        "sendgrid/smtpapi": "~0.6@dev"

Then at the top of your script require the autoloader:

require 'vendor/autoload.php';

Alternative: Install from zip

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

Then require the library from package:


Previous versions of the library can be found in the version index.

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 guided and supported by the SendGrid Developer Experience Team.

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


The MIT License (MIT)