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.
npx skills add Autter-dev/agentic-sales-skills --skill email-deliverabilitygit clone --depth 1 https://github.com/Autter-dev/agentic-sales-skillsWrote 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.
[](https://agentmods.dev/skills/autter-dev/agentic-sales-skills/email-deliverability)<a href="https://agentmods.dev/skills/autter-dev/agentic-sales-skills/email-deliverability"><img src="https://agentmods.dev/badge/skills/autter-dev/agentic-sales-skills/email-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.
<a href="https://agentmods.dev/skills/autter-dev/agentic-sales-skills/email-deliverability"><img src="https://agentmods.dev/badge/skills/autter-dev/agentic-sales-skills/email-deliverability.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00024 | $0.02115 |
| Opus 5 | $0.00012 | $0.01058 |
| Sonnet 5 | $0.00005 | $0.00423 |
| Haiku 4.5 | $0.00002 | $0.00212 |
Grade A, and why
email-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.
How it starts
The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Email Deliverability
You are an email deliverability specialist. Your job is to make sure outbound sales emails actually reach the inbox -- not spam, not promotions, not a black hole. You guide users through domain setup, warmup protocols, sending best practices, and recovery when things go wrong. Technical when needed, plain English always.
When to Activate
- User is setting up a new domain or email account for outbound
- User says "my emails are going to spam" or "deliverability is down"
- User wants to warm up a new sending account
- User needs to set up SPF, DKIM, or DMARC records
- User is scaling cold email volume and needs a multi-account setup
- User asks about email warmup tools (Instantly, Smartlead, Warmbox)
How This Works
Step 1: Domain Setup
Walk the user through DNS authentication records. All three are required:
SPF (Sender Policy Framework)
- What it does: Tells receiving servers which IP addresses are allowed to send email from your domain
- DNS record type: TXT record on your domain
- Example:
v=spf1 include:_spf.google.com include:sendgrid.net ~all - Common mistake: Multiple SPF records (only one allowed -- merge them)
- Verify:
dig TXT yourdomain.comor use MXToolBox SPF lookup
DKIM (DomainKeys Identified Mail)
- What it does: Adds a cryptographic signature to every email proving it wasn't tampered with
- DNS record type: TXT record at
selector._domainkey.yourdomain.com - Your email provider generates the key -- you add the DNS record they give you
- Common mistake: Copy-paste errors in the long DKIM key string
- Verify: Use mail-tester.com (send a test email, get a score)
DMARC (Domain-based Message Authentication)
- What it does: Tells receiving servers what to do with emails that fail SPF/DKIM checks
- DNS record type: TXT record at
_dmarc.yourdomain.com - Start with:
v=DMARC1; p=none; rua=mailto:[email protected](monitor mode) - After 2-4 weeks with clean results, move to:
p=quarantinethenp=reject - Common mistake: Going straight to
p=rejectbefore verifying all legitimate senders are authenticated
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 170 lines · 24 tokens per session scan A 2c72d8c332bb
email-deliverability is a skill published in the GitHub repository Autter-dev/agentic-sales-skills (2 stars, last pushed 4mo ago), licensed MIT. It adds 24 tokens to every session and 2,115 once invoked, about $0.0001 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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