hardbounce-unlock

hardbounce-unlock is a skill for Claude Code, Codex from sendx/email-skills. It costs 49 tokens per session (1,076 once invoked), scanned A, original, MIT.

A review process for accounts locked after too many hard bounces, which are permanent delivery failures such as invalid addresses. It evaluates the sender's explanation, verifies the details, scores risk, and supports an unlock decision and customer reply.

In plain words
What is it for?
Use it to assess unlock requests, check the sending domain and contact-list history, follow verification and decision steps, and draft the response to the customer.
Why use it?
It gives support teams a consistent way to distinguish a legitimate sender with a bad campaign from a sender who may be abusing email.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to assess unlock requests, check the sending domain and contact-list history, follow verification and decision steps, and draft the response to the customer.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sendx/email-skills/esp-hardbounce-unlock
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 sendx/email-skills --skill esp-hardbounce-unlock
Clone the repo
git clone --depth 1 https://github.com/sendx/email-skills

Made for: Claude Code, Codex.

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 hardbounce-unlock

README.md
[![agentmods](https://agentmods.dev/badge/skills/sendx/email-skills/esp-hardbounce-unlock/github.svg)](https://agentmods.dev/skills/sendx/email-skills/esp-hardbounce-unlock)
Your own site
<a href="https://agentmods.dev/skills/sendx/email-skills/esp-hardbounce-unlock"><img src="https://agentmods.dev/badge/skills/sendx/email-skills/esp-hardbounce-unlock/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 hardbounce-unlock

Your own site · 80×15
<a href="https://agentmods.dev/skills/sendx/email-skills/esp-hardbounce-unlock"><img src="https://agentmods.dev/badge/skills/sendx/email-skills/esp-hardbounce-unlock.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,076 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 $0.00049 $0.01076
Opus 5 $0.00024 $0.00538
Sonnet 5 $0.00010 $0.00215
Haiku 4.5 $0.00005 $0.00108

Measured 12d ago against content hash 97c6e46492dd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

hardbounce-unlock 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 12d 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/ESP-hardbounce-unlock/SKILL.md · 124 lines

How it starts

The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hard Bounce Unlock Request Handling

Platform Configuration — Fill These In to Match Your ESP

This skill uses example thresholds by default. Fill in your platform's actual policies below so the investigation and decision logic matches how your ESP works.

  • Hard bounce lock threshold: [e.g., 500+ hard bounces within 10,000 emails sent]
  • Lock behavior: [permanent until manual unlock / auto-unlock after X days]
  • Unlock request method: [e.g., support form, support ticket, email]

Context

An account is automatically locked when it exceeds the hard bounce threshold configured above. The lock is permanent until manually unlocked. Users submit a form which creates a support ticket. Support reps should monitor for locked accounts where the user never submits a form.

Your Job

Understand the story the customer is telling and determine whether it is coherent. Spammers lie. Legitimate senders with bad campaigns tell coherent stories.

Step 1: Read the Form

Before doing anything else, read all form responses. The form captures:

  • Primary sending domain and approximate contact count
  • How long they have used the domain for email marketing
  • How they built the list (signup URL, opt-in method, subscriber expectations)
  • New contacts added in last 30 days, when they last emailed this list
  • Whether they cleaned the list before sending, willingness to enable List Hygiene
  • Confirmation list is not purchased or scraped

Step 2: Verify Their Claims

Check via your internal database and support system:

  • Account creation date and tier upgrade history (did they jump to a high tier immediately?)
  • Actual contact count vs claimed count
  • Previous warnings or locks
  • Sending history and engagement metrics

Check externally:

  • Domain age via WHOIS — does it match their claimed email marketing history?
  • Signup URL — does it exist, work, and match the story?
  • Website legitimacy — does it look like it generates their claimed signup volume?
  • Campaign content — does it match what subscribers expect?

Read the full file on GitHub · 124 lines

Files

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.

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. 12d ago First seen · 124 lines · 49 tokens per session scan A 97c6e46492dd

Subscribe to this mod's changes

hardbounce-unlock is a skill published in the GitHub repository sendx/email-skills (8 stars, last pushed 1mo ago), licensed MIT. It adds 49 tokens to every session and 1,076 once invoked, about $0.0002 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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