audit-deliverability

audit-deliverability is a skill for Claude Code from Misar-AI/misarmail-mcp. It costs 60 tokens per session (459 once invoked), scanned A, original, MIT.

An email-delivery diagnostic workflow for finding why messages go to spam, bounce, or receive few opens. It covers sender authentication, reputation, blocklists, sending volume, and contact-list quality.

In plain words
What is it for?
Checking SPF, DKIM, and DMARC; reviewing domain reputation and warm-up capacity; and finding bounced or complained contacts.
Why use it?
It gathers the main delivery signals together and turns them into a prioritized list of specific records, settings, or contact segments to change.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the misarmail plugin — 9 skills, 3 agents, 2 MCP servers shipped together

Good fit Checking SPF, DKIM, and DMARC; reviewing domain reputation and warm-up capacity; and finding bounced or complained contacts.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/misar-ai/misarmail-mcp/audit-deliverability
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add Misar-AI/misarmail-mcp --skill audit-deliverability
Clone the repo
git clone --depth 1 https://github.com/Misar-AI/misarmail-mcp

Made for: Claude Code.

Or install misarmail, the plugin that ships this one along with the rest of its 9 skills, 3 agents, 2 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for audit-deliverability

README.md
[![agentmods](https://agentmods.dev/badge/skills/misar-ai/misarmail-mcp/audit-deliverability/github.svg)](https://agentmods.dev/skills/misar-ai/misarmail-mcp/audit-deliverability)
Your own site
<a href="https://agentmods.dev/skills/misar-ai/misarmail-mcp/audit-deliverability"><img src="https://agentmods.dev/badge/skills/misar-ai/misarmail-mcp/audit-deliverability/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for audit-deliverability

Your own site · 80×15
<a href="https://agentmods.dev/skills/misar-ai/misarmail-mcp/audit-deliverability"><img src="https://agentmods.dev/badge/skills/misar-ai/misarmail-mcp/audit-deliverability.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 459 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00060 $0.00459
Opus 5 $0.00030 $0.00230
Sonnet 5 $0.00012 $0.00092
Haiku 4.5 $0.00006 $0.00046

Measured 10d ago against content hash a3c552870251, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

audit-deliverability scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/audit-deliverability/SKILL.md · 43 lines

What it actually says

Audit deliverability

Gather everything before concluding

Run all four — a partial picture produces the wrong recommendation:

Tool What it tells you
get_deliverability_score Headline score 0–100 and grade, with contributing factors
run_deliverability_audit Detailed findings across auth, reputation, content, blocklists
check_dmarc (per domain from list_domains) Live SPF/DKIM/DMARC records and alignment failures
get_warmup_status Whether volume is exceeding warm-up capacity

Also call list_contacts with status=bounced and status=complained — a dirty list depresses deliverability no matter how good the DNS is.

Report

Group findings by impact (high / medium / low). Every item must name the specific record, setting, or segment to change. "Improve your SPF record" is not actionable; "add include:_spf.misar.io to the TXT record on example.com, which currently reads v=spf1 -all" is.

Common causes, in the order they actually occur

  1. Missing or misaligned DMARC/SPF/DKIM — by far the most frequent. A From: domain that does not align with the signing domain fails authentication at Gmail and Outlook regardless of content.
  2. Sending above warm-up capacity on a new domain or IP.
  3. List hygiene — mailing bounced or long-unengaged addresses. See the clean-contact-list skill.
  4. Content signals — link shorteners, image-only bodies, missing text part.

Do not

  • Recommend changes to a domain you have not called check_dmarc on.
  • Report a score without saying what is dragging it down.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 43 lines · 60 tokens per session scan A a3c552870251

Subscribe to this mod's changes

audit-deliverability is a skill published in the GitHub repository Misar-AI/misarmail-mcp (1 stars, last pushed 2d ago), licensed MIT. It adds 60 tokens to every session and 459 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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