Postmark focuses exclusively on transactional email, and it shows. Its deliverability rates consistently rank among the highest in the industry because Postmark doesn't allow marketing email on its platform — keeping its IP reputation pristine. The message stream architecture separates different email types, and its inbound processing can turn emails into webhooks. For founders where email delivery is business-critical (receipts, password resets, notifications), Postmark's reliability is unmatched.
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