--- title: 6 Tools for Building Email Automations You Can Test and... description: Email automations can report success at every step while still failing silently, through duplicate sequence enrollments, unsynced unsubscribes, or stuck... canonical: https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: 6 Tools for Building Email Automations You Can Test and Debug | daily.dev og:description: Email automations can report success at every step while still failing silently, through duplicate sequence enrollments, unsynced unsubscribes, or stuck... og:url: https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb og:image: https://api.daily.dev/og/posts/Jx4h8jRwB.png og:image:alt: 6 Tools for Building Email Automations You Can Test and Debug og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # 6 Tools for Building Email Automations You Can Test and Debug **[SitePoint](https://daily.dev/sources/sitepoint)** · 8 min read · 0 upvotes · 0 comments ## Summary Email automations can report success at every step while still failing silently, through duplicate sequence enrollments, unsynced unsubscribes, or stuck replies. Six tools address different parts of this integration problem using a hypothetical agency dashboard as an example. Postman defines the API contract before building the UI. EmailBison illustrates workspace isolation behind an adapter layer. PostgreSQL enforces deduplication with a composite primary key on provider, workspace_id, and event_key. n8n's error workflows classify failures like invalid input, revoked credentials, and rate limits. Mailpit tests application-generated emails, while Playwright verifies that the dashboard distinguishes 'queued' from 'completed' states. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I prevent duplicate webhook events from triggering the same action twice in PostgreSQL? Use a database table with a composite primary key on provider, workspace_id, and event_key, then insert new events with ON CONFLICT (provider, workspace_id, event_key) DO NOTHING RETURNING event_key. A returned row means the event is new; no returned row means it was already processed, which prevents repeated business actions from retried webhook deliveries. _Developers wiring up webhook handlers can find deduplication patterns like this one on daily.dev._ ### What's the right sequence of steps for processing an incoming webhook securely? Verify the request using the provider's supported authentication mechanism, validate the payload and identify its workspace, persist the event durably, acknowledge receipt, then process the event asynchronously. An HTTPS endpoint alone does not prove who sent the request, so authentication verification must happen before any processing occurs. _Anyone building webhook integrations can track practices like this for email automation on daily.dev._ ### How can I test that a dashboard doesn't show a queued operation as already completed? Mock the API response with Playwright using page.route to return HTTP 202 with an operationId and a 'queued' status, then assert the UI shows 'Pause requested' while a 'Campaign paused' text stays not visible. This verifies presentation logic separately from an actual integration test confirming real provider completion. _Teams debugging async UI states can follow approaches like this on daily.dev._ ## Similar posts on daily.dev - [Automating OTP Login in Playwright E2E Tests](https://daily.dev/posts/automating-otp-login-in-playwright-e2e-tests-mn72ermmg) · Medium · 1 upvotes · 0 comments - [8 Best AI Email Generators for Content Marketers \(Based on My Testing\)](https://daily.dev/posts/8-best-ai-email-generators-for-content-marketers-based-on-my-testing--kjfjow77z) · WordPress Beginner · 0 upvotes · 2 comments - [Best Email Marketing Automation Tools for Building a High-Converting List](https://daily.dev/posts/best-email-marketing-automation-tools-for-building-a-high-converting-list-tgm2bnfnf) · Ruby Flow · 0 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#postgresql](https://daily.dev/tags/postgresql) [View this post on daily.dev](https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"6 Tools for Building Email Automations You Can Test and Debug","url":"https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb"},"datePublished":"2026-10-26T16:32:15.778Z","dateModified":"2026-10-26T16:32:46.420Z","description":"Email automations can report success at every step while still failing silently, through duplicate sequence enrollments, unsynced unsubscribes, or stuck...","image":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","thumbnailUrl":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","isAccessibleForFree":true,"articleSection":"SitePoint","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"SitePoint","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/sitepoint","url":"https://daily.dev/sources/sitepoint"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"testing,postgresql","timeRequired":"PT8M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"SitePoint","item":"https://daily.dev/sources/sitepoint"},{"@type":"ListItem","position":3,"name":"6 Tools for Building Email Automations You Can Test and Debug"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/6-tools-for-building-email-automations-you-can-test-and-debug-jx4h8jrwb#faq","mainEntity":[{"@type":"Question","name":"How do I prevent duplicate webhook events from triggering the same action twice in PostgreSQL?","acceptedAnswer":{"@type":"Answer","text":"Use a database table with a composite primary key on provider, workspace_id, and event_key, then insert new events with ON CONFLICT (provider, workspace_id, event_key) DO NOTHING RETURNING event_key. 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