Drupal
To use SendGrid with Drupal, use the STMP Authentication Support module. Install a version of this module that is compatible with your version of Drupal.

Open your modules page, find the SMTP module, and configure it with the following settings:
- SMTP Server - smtp.sendgrid.net
- SMTP Port - 587
- Use Encrypted Protocal - No. If you want encryption choose “Use SSL” and set SMTP Port to 465
- Username - SendGrid Username
- Password - SendGrid Password
