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deliverability-checker

Check email deliverability and DNS configuration. Use when: diagnosing email delivery issues; setting up new email domains; auditing email authentication; checking SPF/DKIM/DMARC; troubleshooting spam folder issues

日本語の概要は準備中です。原文の説明を表示しています。

guia-matthieu/clawfu-skillsスター 150(GitHub 150 + cccskills 0)

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含まれるファイル(3)

  • SKILL.md4.5 KB
  • scripts/main.py11.9 KB
  • scripts/requirements.txt30 B

SKILL.md(原文)

インストールする前に、エージェントに与えられる指示の中身を確認できます。

Email Deliverability Checker

Diagnose email deliverability issues by checking SPF, DKIM, DMARC, and other DNS records - fix why your emails land in spam.

When to Use This Skill

  • Delivery troubleshooting - Emails landing in spam
  • New domain setup - Configure email authentication
  • Migration audit - Verify email config after domain change
  • Client onboarding - Check client email health
  • Compliance check - Ensure proper authentication

What Claude Does vs What You Decide

Claude DoesYou Decide
Structures analysis frameworksMetric definitions
Identifies patterns in dataBusiness interpretation
Creates visualization templatesDashboard design
Suggests optimization areasAction priorities
Calculates statistical measuresDecision thresholds

Dependencies

pip install dnspython click

Commands

Full Audit

python scripts/main.py audit example.com
python scripts/main.py audit example.com --output report.html

Check SPF

python scripts/main.py spf example.com

Check DKIM

python scripts/main.py dkim example.com --selector google
python scripts/main.py dkim example.com --selector default

Check DMARC

python scripts/main.py dmarc example.com

Check MX Records

python scripts/main.py mx example.com

Examples

Example 1: Full Email Audit

python scripts/main.py audit acme-corp.com

# Output:
# Email Deliverability Audit: acme-corp.com
# ──────────────────────────────────────────
# MX Records:      ✓ Found (Google Workspace)
# SPF:             ✓ Valid
# DKIM (google):   ✓ Valid
# DMARC:           ✗ Missing (CRITICAL)
#
# Score: 75/100
#
# Issues Found:
# 1. [CRITICAL] No DMARC record found
#    Fix: Add TXT record for _dmarc.acme-corp.com
#    Value: v=DMARC1; p=none; rua=mailto:dmarc@acme-corp.com

Example 2: Diagnose SPF Issues

python scripts/main.py spf newsletter-sender.com

# Output:
# SPF Analysis: newsletter-sender.com
# ────────────────────────────────────
# Record: v=spf1 include:_spf.google.com include:sendgrid.net ~all
#
# Status: ✓ Valid
#
# Authorized Senders:
# - Google Workspace (include:_spf.google.com)
# - SendGrid (include:sendgrid.net)
#
# Policy: ~all (soft fail)
# Warning: Consider changing to -all (hard fail) for better security

Email Authentication Records

RecordPurposeLocation
SPFAuthorize sending serversTXT on root domain
DKIMCryptographic signatureTXT on selector._domainkey
DMARCPolicy and reportingTXT on _dmarc subdomain
MXMail delivery serversMX on root domain

Common SPF Includes

ProviderSPF Include
Google Workspaceinclude:_spf.google.com
Microsoft 365include:spf.protection.outlook.com
SendGridinclude:sendgrid.net
Mailchimpinclude:servers.mcsv.net
Amazon SESinclude:amazonses.com

DKIM Selectors by Provider

ProviderCommon Selector
Google Workspacegoogle
Microsoft 365selector1, selector2
SendGrids1, s2
Mailchimpk1

Deliverability Score Factors

FactorWeightImpact
Valid MX20%Can't receive replies
Valid SPF25%Server authorization
Valid DKIM25%Message integrity
Valid DMARC30%Policy enforcement

Skill Boundaries

What This Skill Does Well

  • Structuring data analysis
  • Identifying patterns and trends
  • Creating visualization frameworks
  • Calculating statistical measures

What This Skill Cannot Do

  • Access your actual data
  • Replace statistical expertise
  • Make business decisions
  • Guarantee prediction accuracy

Related Skills

Skill Metadata

  • Mode: centaur
category: email-tools
subcategory: deliverability
dependencies: [dnspython]
difficulty: beginner
time_saved: 2+ hours/week

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