Getting Started
Amazon SES
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Amazon SES (Simple Email Service).
Standard Constants
Reference documentation for the CONSTANTS that are provided with the plugin but are not related to any specific integration.
Hooks
This category contains the available hooks that are available to developers within Gravity SMTP in order to extend its functionality.
Constants
This category contains a list of the constants that can be set within the wp-config.php file of your WordPress installation.
Brevo
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Brevo mail sending service.
User Guides
Google / Gmail
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Google / Gmail to send transactional emails.
Integrations
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.
Mailchimp Transactional
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Mailchimp Transactional.
Mailgun
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Sinch Mailgun mail 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.
SendGrid
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Twilio Sendgrid mail sending service.
Zoho Mail
This section contains all articles specifically related to integrating your Gravity SMTP setup with the Zoho Mail sending service.
Articles
Brevo Settings Reference
This quick reference guide lists all settings related to the Brevo integration in Gravity SMTP and briefly describes their purpose.
gravitysmtp_feature_flag
The gravitysmtp_feature_flag allows developers to disable features in Gravity SMTP.
Amazon SES Constants
When set, these optional constants will override settings for the Amazon SES integration in Gravity SMTP. Default values are shown.
GRAVITYSMTP_DISPLAY_SETUP_WIZARD
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.