Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.
This module allows for programmatic creating and sending of emails. It exposes an OOP and twig template based API replacing the messy hook based approach used by Drupal core.
Webservice Manager is a configuration manager for webservices calls.
Provides DHL Express (Soap v2) integration with Drupal Commerce Shipping
This module provides Drush commands that can be used to read MQ data and pass it to other modules that process it.
Drupal core uses the RFCValidation from egulias/EmailValidator to validate email addresses. However, the RFC allows for email addresses with no domain, which is often not the desired behaviour.