What is the WordPress `pre_wp_mail` filter and how can it be used to prevent emails in testing environments?

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What is the WordPress `pre_wp_mail` filter and how can it be used to prevent emails in testing environments?

Key points

  • pre_wp_mail is triggered before email sending
  • It can intercept emails for testing purposes
  • Returning a non-null value from a callback stops the email from being sent
  • Useful for redirecting emails in staging environments

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