NO LONGER MAINTAINED. Send emails and upload contacts through SendGrid from your WordPress installation using SMTP or API integration.

SendGrid

This plugin is no longer supported and will not work with the latest WordPress release. Feel free to fork the code from <a href="https://github.com/sendgrid/wordpress/" rel="nofollow ugc">GitHub</a> and revise the plugin to work for your needs. To learn more about Twilio SendGrid services visit SendGrid.com.
What is the SendGrid WordPress Plugin?
SendGrid’s cloud-based email infrastructure relieves businesses of the cost and complexity of maintaining custom email systems. SendGrid provides reliable deliverability, scalability, and real-time analytics along with flexible APIs that make custom integration with your application a breeze.
SendGrid’s WordPress plugin replaces WordPress’s default wp_mail() function by using either an SMTP or API integration with SendGrid to send outgoing email from your WordPress installation. It also allows you to upload contacts directly to your SendGrid Marketing Campaigns account via a subscription widget.
By using the SendGrid plugin, you will be able to take advantage of improved deliverability and an expanded feature set, including tracking and analytics, to enhance user engagement on your WordPress installation. SendGrid also provides world class customer support, should you run into any issues.
For more details, <a href="https://sendgrid.com/docs/Integrate/Tutorials/WordPress/index.html" rel="nofollow ugc">consult our official documentation</a>.
For assistance you can contact SendGrid Support from the <a href="https://support.sendgrid.com/" rel="nofollow ugc">SendGrid Support Portal</a>. Click Login &amp; Contact Support, and then Contact Support to see your support contact options. Paying SendGrid customers have the option to contact support via phone, chat, or by submitting a ticket using our web form. All SendGrid customers have the option to submit a ticket using our web form.
<h4>The Subscription Widget</h4>
SendGrid’s WordPress Subscription Widget makes it easy for people visiting your WordPress site to subscribe to your marketing emails, such as any newsletters, announcements, or promotional offers you may send. Upon signup, they’ll automatically receive an opt-in email allowing them to confirm their desire to begin receiving your emails. This confirmation constitutes “double opt-in,” a deliverability best practice.
For more details, consult the official documentation for the <a href="https://sendgrid.com/docs/Integrate/Tutorials/WordPress/subscription_widget.html" rel="nofollow ugc">Subscription Widget</a>
<h4>Multisite</h4>
If you are using the SendGrid plugin in a Multisite environment, you need to Network Activate it. You can then access the settings page on the network dashboard and the configure settings will be used for all sites.
You can enable access for SendGrid settings to each subsite in the Multisite Settings tab. If the checkbox is unchecked then that site will not see the SendGrid settings page and it will use the settings set on the network. 
Warning! When you activate SendGrid management for a subsite, that site will not be able to send emails until the admin updates the SendGrid settings on that subsite.
If you already had the plugin installed in a Multisite environment and you update to versions after 1.9.0 you may need to reconfigure your plugin.

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