phpBB supports sending email over SMTP. To have phpBB relay email through SendGrid go to Client Communication > E-mail settings in the admin panel and change:

  • Use SMTP server for e-mail - Yes
  • SMTP server address: -
  • SMTP server port - 587
  • Authentication method for SMTP - PLAIN
  • SMTP username - sendgrid_username
  • SMTP password - sendgrid_password

The following image shows these settings.

Configure SendGrid with phpBB

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