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meloShaya
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deliverability-incident-response

Diagnose and remediate cold email deliverability incidents using decision-tree triage playbooks.

Updated May 28, 2025
Search Tags:#incident response#cold email#email deliverability#warmup#bounce rate#spam triage#domain blacklist
One-click install
npx skills add https://github.com/meloShaya/insteltech --skill deliverability-incident-response-meloshaya
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: deliverability-incident-response
Source: https://github.com/meloShaya/insteltech/tree/main/crm/library/skills/deliverability-incident-response
Command: npx skills add https://github.com/meloShaya/insteltech --skill deliverability-incident-response-meloshaya

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? When cold email campaigns suddenly fail — reply rates drop, bounce rates spike, domains get blacklisted, or inboxes get blocked in warmup — teams need a structured triage process instead of guesswork. This Skill provides decision trees that identify the root cause and prescribe time-ordered fixes. ## Core Features & Use Cases - Five Incident Playbooks: Covers reply rate drops, bounce rate spikes, domain blacklisting, warmup blocks, and Gmail promotional tab placement, each with first actions and expected fix timelines. - Step-by-Step Decision Trees: Quantifies whether a drop is real, distinguishes fleet-wide from campaign-specific issues, and sequences checks across spam placement tests, DKIM/DMARC authentication, warmup status, and bounce types. - Recovery Procedures: Includes a 72-hour total-failure checklist, inbox retirement workflows, domain replace-vs-repair criteria, and a 7-day re-audit schedule to confirm recovery. - Use Case: Your reply rate fell 60% this week. Follow the decision tree to run a spam placement test, identify a DKIM_INVALID filter firing, fix the DNS records, cut send volume 50%, and re-test after 14 days. ## Quick Start Triage my cold email incident: reply rate dropped sharply this week across all campaigns, walk me through the decision tree.

Frequently Asked Questions about deliverability-incident-response

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fix cold emails landing in spam?▼

Run a spam placement test first to confirm inbox placement below 70%, then check the spam filter details report for specific triggers like DKIM_INVALID, HTML_MESSAGE, or LINK_REDIRECT. Fix the identified issues, cut daily send volume by 50%, and re-test after 14 days.

What should I do when email bounce rate spikes above 3%?▼

First determine whether bounces are hard (invalid addresses) or soft (temporary). Hard bounces indicate a list quality problem requiring verification through a tool like MillionVerifier; soft bounces indicate domain reputation issues requiring reduced sending volume. Above 5%, stop the campaign immediately.

How do I check if my sending domain is blacklisted?▼

Check Spamhaus, Barracuda, and SURBL through your spam test report's blacklist detail, and cross-reference with MX Toolbox for a second opinion. Domains on Spamhaus DBL or SURBL may need full replacement, while minor lists like Barracuda accept delisting requests resolved in 3-7 days.

Why is my inbox blocked in warmup and how do I fix it?▼

A blocked warmup flag usually means warmup emails looked like spam to the network or the provider is rate-limiting. Young inboxes under 30 days should be retired and replaced; established inboxes can try re-enabling warmup with a lower daily warmup count around 15.

When should I replace a blacklisted domain instead of repairing it?▼

Replace domains under 30 days old since cleanup effort exceeds their value. Domains older than 90 days justify repair: stop sending for 7 days, submit delisting requests, and slowly resume. Replacement domains need 2 weeks of warmup before reuse.

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