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MODX supports sending email over SMTP. To have MODX relay email through SendGrid go to System Settings > 'Mail' area and change:

  • SMTP Authentication - Yes
  • SMTP Hosts -
  • SMTP Password - sendgrid_api_key
  • SMTP Port - 587
  • SMTP Connection Prefix - tls
  • SMTP User - sendgrid_username (use apikey for v3 API or later)
  • Use SMTP - Yes

The following image shows these settings.

MODX SMTP with SendGrid.

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