Joomla supports sending email over SMTP. To have Joomla relay email through SendGrid go to Site > Global Configuration and change:

  • Mailer – SMTP
  • SMTP Host -
  • SMTP Port – 587
  • SMTP Security – STARTTLS
  • SMTP Authentication - Yes
  • SMTP User - "apikey"
    SMTP User must be the exact string, "apikey"
  • SMTP Pass -
    SMTP Pass is your actual API key
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