# How to keep your Postmark account secure: Best practices guide

DevFeed: [How to keep your Postmark account secure: Best practices guide](<https://devfeed.tech/articles/how-to-keep-your-postmark-account-secure-best-practices-guide-16079.md>)

Original publisher: [Read original article](<https://postmarkapp.com/blog/how-to-keep-your-postmark-account-secure-best-practices-guide>)

Author: Postmark team (fdossetto+postmark@activecampaign.com)

Published: 2025-10-21T14:42:00Z

Content type: tutorial

Language: en

Sources: [Postmark (en-US)](<https://devfeed.tech/sources/postmark-en-us.md>)

Topics: [Secrets Management](<https://devfeed.tech/topics/secrets-management.md>), [Security](<https://devfeed.tech/topics/security.md>), [Application Security](<https://devfeed.tech/topics/application-security.md>), [API](<https://devfeed.tech/topics/api.md>), [Node.js](<https://devfeed.tech/topics/node-js.md>)

Tags: [api-security](<https://devfeed.tech/tags/api-security.md>), [application-security](<https://devfeed.tech/tags/application-security.md>), [authentication](<https://devfeed.tech/tags/authentication.md>), [deployment](<https://devfeed.tech/tags/deployment.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [error-handling](<https://devfeed.tech/tags/error-handling.md>), [secrets-management](<https://devfeed.tech/tags/secrets-management.md>), [security](<https://devfeed.tech/tags/security.md>)

## AI overview

This guide explains how to secure Postmark accounts and API tokens using OWASP-aligned practices. It emphasizes validating tokens, securing configuration and deployment processes, validating data, preventing credential leaks in error messages, and storing credentials in dedicated secrets management tools rather than code repositories.

## Source excerpt

Your Postmark API tokens are the keys to your email kingdom. One exposed token can mean unauthorized access to your account, potential data breaches, and a whole lot of stress you don't need. The good news? Keeping your account secure doesn't have to be complicated. This guide covers the essential practices that'll help you sleep better at night, knowing your Postmark credentials are locked down tight. Following Industry Standards: OWASP Guidelines When it comes to web application security, you don't have to reinvent the wheel. The Open Web Application Security Project (OWASP) provides comprehensive, industry-standard guidance that's trusted by security professionals worldwide. The OWASP Web Security Testing Guide The OWASP Web Security Testing Guide is an essential resource for developers who want to build secure applications. While it covers much more than just secret management, several sections are particularly relevant to protecting your Postmark credentials: Key areas that apply to API security: Authentication Testing - Ensuring your API tokens are properly validated Configuration and Deployment Management Testing - Securing your deployment pipeline Data Validation Testing - Validating inputs that might expose credentials Error Handling - Ensuring error messages don't leak sensitive information Applying OWASP Principles to Your Email Infrastructure Here's how OWASP best practices translate to protecting your Postmark setup: Secure Configuration Management: Follow OWASP's guidance on configuration security by keeping all sensitive Postmark credentials in dedicated secrets management tools, never in code repositories. Why OWASP Matters for Email Security Email infrastructure is often overlooked in security assessments, but it's a critical attack vector. A compromised email service can lead to: Account takeover attacks through password reset emails Data exfiltration via email forwarding Social engineering attacks using legitimate email channels Compliance violati