• CRITICAL
  • RETRY
  • ACTION
  • HUMAN

How to debug email delivery failures with your AI

Connect Postmark to your AI client once. From there, your agent handles the heavy lifting of digging through logs to find the exact reason an email failed.

Ask AI about this page

Short answer

How do I debug email delivery failures with my AI?

Your AI uses Postmark to pull bounce lists and specific SMTP error logs. It then parses those logs to tell you exactly which error codes caused the delivery failure. You get a clear breakdown of why messages didn't land.

Outcome mapping

Where every issue lands.

The AI categorizes every delivery failure into actionable buckets.

CRITICAL

Hard bounces

The AI identifies permanent failures like invalid addresses. It flags these so you can clean your list immediately.

RETRY

Soft bounces

The AI spots temporary issues like full mailboxes. It tells you which ones are worth waiting on and which aren't.

ACTION

Spam triggers

The AI looks for error codes related to content filtering. You'll see if your reputation or your message is the problem.

HUMAN

Manual fixes

The AI highlights complex SMTP errors that require you to change your sending infrastructure or IP reputation. These stay on your plate.

The workflow

What your AI does when a bounce occurs.

Instead of you clicking through dashboards, your agent does the searching.

  1. Identify failures

    The AI scans your recent delivery history to find every message that didn't reach the recipient.

    list_bounces

  2. Extract technical logs

    For every failed message found, the AI pulls the raw SMTP data from the provider.

    get_bounce_logs

  3. Parse error codes

    The AI reads the raw text to find specific SMTP status codes that explain the rejection.

    get_bounce_logs

  4. Summarize causes

    The AI groups these errors into plain English so you know if the issue is the recipient, the content, or the server.

    list_bouncesget_bounce_logs

Try it

Copy these to start.

Use these prompts to trigger the Postmark tools.

Starting points

These are just ways to kick off the conversation. Swap out the specific email addresses or timeframes to match your needs.

Postmark Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_KPq8li4s6pf752WqbtPQw1PlrIw8fp2WAbMU1CoL/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Postmark capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "postmark-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_KPq8li4s6pf752WqbtPQw1PlrIw8fp2WAbMU1CoL/mcp"
    }
  }
}
Copy into chat04

  • List all the bounces from my Postmark account from the last 24 hours.

  • Get the bounce logs for the failed email sent to user@example.com.

  • Why did my last five emails to the marketing list bounce?

  • Summarize the most common SMTP error codes I've seen in my recent bounces.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Postmark once, then ask.

Just link your Postmark account through Vinkius. Your credentials stay encrypted, and you can immediately start asking your AI about your email logs.

Connect Postmark to your AI

FAQ

How this task behaves.

  • 01

    Can the AI resend a bounced email?

    No. The AI can only read logs and identify errors. You have to trigger resends through your own email sending logic or Postmark dashboard.

  • 02

    Can the AI delete bounces from my Postmark account?

    No. The tools only allow the AI to read bounce lists and logs. It cannot modify or delete any data in your Postmark account.

  • 03

    Does the AI see the full content of my emails?

    No. The AI only accesses the SMTP logs and bounce metadata provided by the tools.

  • 04

    Can I use this with Claude?

    Yes, as long as you are using Claude through an MCP-compatible client.

  • 05

    How does the AI know which error code is which?

    The AI reads the raw SMTP response strings returned by the get_bounce_logs tool and interprets the standard error codes.

  • More questions about Postmark? The Connector page answers them. See everything the Postmark Connector can do

Connect Postmark to Claude, Cursor, ChatGPT & more