Filters

Discover the different filter hooks available within Gravity SMTP. You can use filters to modify data to better match your particular needs.

Actions

Learn about the different action hooks available within Gravity SMTP. Action hooks allow you to perform additional actions when an event takes place.

Hooks

This category contains the available hooks that are available to developers within Gravity SMTP in order to extend its functionality.

Standard Constants

Reference documentation for the CONSTANTS that are provided with the plugin but are not related to any specific integration.

Amazon SES

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Amazon SES (Simple Email Service).

Getting Started

Brevo

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Brevo mail sending service.

Constants

This category contains a list of the constants that can be set within the wp-config.php file of your WordPress installation.

User Guides

Integrations

Elastic Email

This section contains all articles specifically related to integrating your Gravity SMTP setup with Elastic Email

Developer

This category contains documentation related to developer-specific use cases of the Gravity SMTP plugin. The items contained here are not required for normal operation of Gravity SMTP.

Emailit

This section contains all articles specifically related to integrating your Gravity SMTP setup with Emailit

Google / Gmail

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Google / Gmail to send transactional emails.

Mailchimp Transactional

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Mailchimp Transactional.

MailerSend

This section contains all articles specifically related to integrating your Gravity SMTP setup with MailerSend

Mailgun

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Sinch Mailgun mail sending service.

Mailjet

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Mailjet sending service.

Microsoft 365 / Outlook

This category includes documentation related to integrating Gravity SMTP with a Microsoft 365 account outgoing email service.

Postmark

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Active Campaign's Postmark mail sending service.

Resend

This section contains all articles specifically related to integrating your Gravity SMTP setup with Resend

SendGrid

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Twilio Sendgrid mail sending service.

SMTP2GO

This section contains all articles specifically related to integrating your Gravity SMTP setup with SMTP2GO

SparkPost

This section contains all articles specifically related to integrating your Gravity SMTP setup with the SparkPost sending service.

Zoho Mail

This section contains all articles specifically related to integrating your Gravity SMTP setup with the Zoho Mail sending service.

Articles

Amazon SES Constants

When set, these optional constants will override settings for the Amazon SES integration in Gravity SMTP. Default values are shown.

GRAVITYSMTP_SETUP_WIZARD_SHOULD_DISPLAY

Setting this constant will suppress the Gravity SMTP setup wizard, preventing it from appearing when the plugin is first installed.

Mailchimp Transactional Constants

Constants available for the Mailchimp Transactional integration.

SendGrid Settings Reference

This quick reference guide lists all settings related to the SendGrid integration in Gravity SMTP and briefly describes their purpose.

Postmark Settings Reference

This quick reference guide lists all settings related to the Postmark integration in Gravity SMTP and briefly describes their purpose.

Microsoft 365 / Outlook Settings Reference

This quick reference guide lists all the settings related to the Microsoft 365 / Outlook integration within Gravity SMTP and provides a short description of their purpose.

Mailgun Settings Reference

This quick reference guide lists all settings related to the Mailgun integration in Gravity SMTP and briefly describes their purpose.

Google / Gmail Settings Reference

This quick reference guide lists all the settings related to the Google / Gmail integration within Gravity SMTP and provides a short description of their purpose.

Amazon SES Settings Reference

This quick reference guide lists all the settings related to the Amazon SES integration within Gravity SMTP and provides a short description of their purpose.

Adding and Authenticating a Domain in Mailchimp Transactional

This article outlines steps for adding and verifying a domain in your Mailchimp Transactional account.