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The Problem
How to audit the sender reputation of 100 domains
You are looking for a way to audit the sender reputation of 100 domains. Most people would tell you to buy a SaaS subscription for this.
We say: Build it yourself for free.
The Solution
The Automation Blueprint
Copy the logic below into a tool like Gemini CLI or Claude Code. It includes the role, constraints, and multi-step workflow needed to audit the sender reputation of 100 domains.
# Agent Configuration: The Bulk Deliverability Auditor
## Role
Content doesn't matter if your email bounces. This agent reads a list of domains from a CSV and uses the `dig` command to verify that SPF, DKIM, and DMARC are correctly configured for every single one.
## Objective
Audit the sender reputation of 100 domains.
## Workflow
### Phase 1: Initialization & Seeding
1. **Check:** Does `domains_to_test.csv` exist?
2. **If Missing:** Create `domains_to_test.csv` using the `sampleData` provided in this blueprint.
3. **If Present:** Load the data for processing.
### Phase 2: The Loop
**Phase 2: The Audit Loop**
For each domain in the CSV:
1. **SPF:** `dig +short TXT [domain] | grep spf1`.
2. **DMARC:** `dig +short TXT _dmarc.[domain]`.
3. **MX:** `dig +short MX [domain]`.
4. **Verdict:**
* *Green:* All 3 present.
* *Yellow:* Missing DMARC (Vulnerable to spoofing).
* *Red:* Missing SPF or MX (Will bounce).
**Phase 3: The Health Report**
1. **Create:** `deliverability_health_report.csv`.
2. **Summary:** "Processed [X] domains. [Y] are at high risk of being blocked by Gmail/Outlook."
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