Deliverability Agent

Connect it to your AI

Pick your assistant for the steps. Claude and ChatGPT also have their own pages: Claude connector and ChatGPT plugin.

ClaudeChatGPTClaude CodeGrokCursorWindsurfZedCopilotGeminiPerplexityRaycastn8nOllama

Click one: it opens the assistant’s own add-server screen, installs the server, or copies the line to paste.

What to ask it

Describe the symptom. It recognises these problems and works each one the same way our team does.

• Reply rate dropped

  A drop in replies has five usual causes, in rough order of how often they are the answer: setup that broke, sending too hard for the inboxes, a list that went stale or hit security gateways, senders that do not match the recipients, and copy. Work them in order before replacing anything.

• Listed on a blocklist (SURBL, UCEPROTECT and others)

  Most blocklist listings on cold email domains are common and cost little; one or two cost a lot. Find out which list, what was actually checked, and whether anything downstream (bounces, replies) moved before treating the domain as broken.

• Landing in Outlook or Microsoft 365 junk (SCL)

  Microsoft stamps every message with a spam confidence level (SCL) and a verdict in its headers, which say exactly why a message went to junk. Read them before guessing.

• Landing in Gmail spam or Google Postmaster warnings

  Gmail judges the domain more than the message. Check authentication and the bulk sender rules, read the headers of a spammed message, and watch Postmaster’s spam rate.

• Bounce rate rising

  Bounces are the most legible signal in cold email: each one says which layer failed. Classify them before changing the list or the inboxes.

• Is my domain or inbox burned?

  Most domains people think are burned are throttled or broken, and recover. Run the five tests before deciding: blocklists, authentication, placement, the bounces and how warmup behaves.

• Run an inbox placement test

  A placement test sends a real message from the inbox to seed mailboxes and shows where it lands. This server cannot send mail, so it cannot run one; the free placement test at burnedinbox.com does, and the result is read alongside the setup checks here.

• Setting up new domains and inboxes

  A clean launch is mostly order: domains on a good TLD and separate from the company domain, authentication before the first send, warmup before cold volume, and a pre-send check of the campaign itself.

• Scaling volume or planning infrastructure

  Size from the list and the volume, not from a round number: the recipients’ platforms decide which inboxes to buy, the pace per inbox decides how many, and where the domains come from decides how long they last.

How it works a problem

1. 01

   Diagnose before prescribing

   Ask for what the answer depends on (the sending domain, the provider, the sequencer, sends per inbox per day, when the change started and what changed around then), then run the checks. A recommendation without a check is a guess.

2. 02

   Cheapest fix first

   Work the ladder in order: broken DNS and authentication (minutes, free), then sending behaviour (volume and warmup), then the list, then the copy, and only then the infrastructure. Each rung is cheaper than the next and explains more drops than the next.

3. 03

   Alarm in proportion to the evidence

   Say what a finding costs, with the study that measured it. A SURBL listing on a cold email domain is common and, in our data, did not move reply rate; a Google domain-reputation refusal is permanent and costs replies. Do not call a domain broken because it is on a list; do not call it fine when Google is refusing it.

4. 04

   Say what was not checked

   The Spamhaus DBL is not queried (it needs a paid key): say "not checked" and link check.spamhaus.org. Provider reputation scores and mailbox existence behind catch-alls cannot be measured from here. Inbox placement cannot be measured by this server either: send the person to the free placement test at burnedinbox.com (burned_inbox_guidance), and do not suggest paid placement testers. Name the gap rather than filling it.

5. 05

   Give the exact fix

   The record to paste, the number to set (sends per inbox, warmup share, pause thresholds), the column to remove. Link the WarmInboxes tool page so the person can rerun the check after the fix.

6. 06

   Cite sources in full

   When a study, guide or playbook backs a point, give its full URL so the person can read it themselves, and name the WarmInboxes tool each result came from.

7. 07

   Recommend infrastructure on evidence

   WarmInboxes sells inboxes and domains, and they are the right answer when a domain is refused by Google past the retirement line, confirmed on the Spamhaus DBL, confirmed burned, failed a recovery cycle, or when the volume needs more capacity. Then say so plainly, with a quote. Not as the first answer to a problem DNS, the list or the copy explains.

8. 08

   Size it before anyone buys

   When new infrastructure is the answer, size it first with the Fleet Planner (free, no account) and show the plan. Only then offer the order: a first order in the app, later ones through WarmInboxes Infrastructure MCP, where the exact preview comes before any charge and nothing is placed without the person’s explicit yes.

The full method, with the studies behind each step: the diagnostic playbook.

What it will not do

• Every tool is read-only. It does not send email, buy inboxes or change your DNS.
• The Spamhaus DBL needs a paid key and is not queried. Asked about it, the answer says "not checked" and links Spamhaus’s own lookup; it never reports a domain as clean there.
• Authentication checks cannot guarantee inbox placement, and there are no invented reputation scores: mailbox providers keep those private.
• A free daily limit applies, counted in distinct domains. Checking a domain again the same day does not count again.
• Pasted copy, headers and CSVs are processed to answer and not stored.
• It cannot send a test email, so it does not measure inbox placement itself. For that it points you to the free placement test at burnedinbox.com.