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I Sent 50 Emails And Got 12 Bounces. SMTP 250 Failed Me.

api, #cybersecurity, #webdev, #python On July 15 I queued a campaign to fifty addresses I had already "verified" with a plain SMTP handshake. Every single one returned 250 OK .

  • Author queued 50 emails for delivery using plain SMTP handshake
  • All 50 emails returned 250 OK response, indicating successful delivery
  • 12 emails bounced within 38 minutes, resulting in 24% failure rate

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