Source

Features page (SMTP relay) — Postmark

Checked for Postmark on 1 Nov 2026

Technical details

type: page
http status: 200
content hash: sha256:2bf2693c71fbfaeeb7ffeb73c0ed6f5464d74bd8abcd89afa950f38b78a4652f
permission: robots_ok
screenshot: Screenshot on file (internal exhibit, not published)

Cited by

Smtp host Report an error

“MAIL_HOST=smtp.postmarkapp.com”
Smtp port Report an error

“MAIL_PORT=587”
Smtp auth token Report an error

“MAIL_USERNAME=YOUR_POSTMARK_SERVER_API_TOKEN”
Tls Report an error

“Postmark supports TLS to secure data sent between your application and our servers.”
Custom metadata Report an error

“Specify metadata like invoice and customer IDs to identify messages at any point in their lifecycle. This information then becomes accessible through the Postmark API, webhooks, and web app.”
Tags Report an error

“Access this feature by adding an X-PM-Tag header when sending email using SMTP.”
Framework guides Report an error

“Setting up your web application to send emails using SMTP couldn’t be easier. It’s as simple as copying some credentials into a config file and you’re ready to send.”
API alternative Report an error

“Not sure whether to send using our API or SMTP service?”

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