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
Using Constants To Hide Your Sensitive Settings
By using constants in your site’s wp-config.php file, you can securely store this information outside the WordPress admin interface.
GRAVITYSMTP_INTEGRATION_BACKUP
For advanced configurations and multisite setups, you can define a Backup integration for Gravity SMTP using constants.
GRAVITYSMTP_INTEGRATION_PRIMARY
For advanced configurations and multisite setups, you can define a Primary integration for Gravity SMTP using constants.
GRAVITYSMTP_ENABLED_EXPERIMENTAL_FEATURES
The GRAVITYSMTP_ENABLED_EXPERIMENTAL_FEATURES constant allows you to enable or disable experimental features in Gravity SMTP.
Alerts Constants
When set, these optional constants will override settings for the Alerts feature.
How To Send Emails From An Alias In Google / Gmail
This article explains configuring Gravity SMTP to send emails using a Gmail alias from a Google / Gmail account.
Zoho Mail Constants
Constants available for the Gravity SMTP Zoho Mail Integration.
Suppressing Email Addresses
This guide will walk you through how to use the suppression list, including adding, managing, and reactivating suppressed addresses.
Zoho Mail Settings Reference
This reference guide lists all settings related to the Zoho Mail integration in Gravity SMTP and describes their purpose.
Creating An App In Your Zoho API Console
This article outlines the steps required to create a web app in your Zoho API Console.