A transactional email service built for developers, optimised for speed and inbox placement.
⚡ Monitored by EmailExacto IntelligencePostmark is an email service provider (ESP) that handles sending infrastructure, IP reputation management, and delivery feedback for email campaigns, transactional messages, or both. Their sending reputation and your domain's authentication configuration are the two primary drivers of inbox placement when using Postmark.
Postmark requires DKIM setup via DNS CNAME records. Postmark enforces strict sending rules — only transactional email on standard servers, with separate Message Streams for transactional and bulk to maintain reputation separation.
When you send through Postmark, messages leave via their SMTP servers or API. The receiving server sees Postmark's sending IPs in the Received headers. For your domain to pass DMARC, you must configure Postmark's DKIM keys and SPF include: in your DNS. Without this, email sent through Postmark fails authentication for your domain.
Postmark uses fully dedicated IP infrastructure per account, meaning your reputation is your own from day one. They maintain strong deliverability through strict sender enforcement. Bounce and complaint data are available via webhooks and the API.
Your ESP affects deliverability through their shared IP pool quality, feedback loops and bounce handling, and ease of authentication configuration. Postmark's dedicated IP model and strict transactional focus make it one of the highest-deliverability options for critical transactional email.
Regardless of ESP, the fundamentals are yours to control: domain authentication, list hygiene, engagement rates, and complaint rates have more long-term deliverability impact than the ESP choice itself.
EmailExacto Intelligence monitors your sending domain independently of your ESP — giving you visibility into authentication, blacklist status, and inbox placement regardless of which platform you send through.
✓Configure DKIM by adding Postmark's CNAME records to DNS — required before sending.
✓Set up Postmark webhooks to receive bounce, complaint, and delivery events.
✓Use separate Message Streams for transactional and bulk mail.
✓Respect Postmark's transactional-only policy on standard servers.
✓Monitor your bounce rate — sustained high rates trigger account review.
✓Set a DMARC record to verify alignment and receive aggregate reports.
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