Works with the AI Agents you already use

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    Email Deliverability Doctor (Bundle)

    1

    Diagnoses why email lands in spam: sender setup, subject lines, spam copy and warmup planning.

    $29

    Secure checkout via Stripe

    Money-back guarantee

    Converts to your local currency at checkout

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    Email Deliverability Doctor (Bundle)

    Email Deliverability Doctor (Bundle)

    Example session with this skill installed

    I'm getting a '550 5.7.26' error when sending to Gmail. My SPF seems okay. Can you look at this bounce message and tell me what's wrong?

    • Read your context and instructions
    • Compiled the email deliverability doctor

    That error usually points to a DMARC failure. Gmail is tightening the screws on authentication. Your SPF might pass, but if your DKIM signature is missing or misaligned, the 'p=reject' policy will bounce the mail. Check your DKIM selector in your DNS settings immediately.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    Diagnoses why email lands in spam: sender setup, subject lines, spam copy and warmup planning.

    What is inside

    The persona plus 4 skills.

    • sender setup walkthrough
    • spam copy audit
    • subject line risk checker
    • warmup ramp planner

    Use cases

    • Reviewing DNS records to ensure authentication protocols are correctly implemented.
    • Decoding cryptic bounce-back logs to identify why specific providers are blocking you.
    • Auditing cold outreach copy for spam-trigger patterns and engagement-killing phrases.
    • Developing a warmup schedule for new domains or IP addresses.

    Known limitations

    Does not perform live DNS lookups or real-time blocklist queries. Cannot provide legal advice regarding GDPR or CAN-SPAM compliance.

    Free starter: Email Deliverability Doctor (Free Starter)

    Find more skills like this on the Claude Skills Marketplace, the Codex Skills Marketplace and the Gemini Skills Marketplace, or browse Claude Skills for Sales & Lead Gen.

    Does not perform live DNS lookups, network checks, or real-time blocklist queries. Requires the user to manually verify records and apply DNS changes.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before buying a skill.

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    Fresh listing

    Recently published to Agensi

    Money-back guarantee

    Doesn't do what its page promises? You get your money back.

    Trust & safety

    Security scan

    Security scan passed 3 months ago

    Permissions

    No special permissions declared or detected

    Listed3 months ago
    Updated6 days ago

    What's inside

    Frequently Asked Questions

    This persona functions as a specialized deliverability engineer that analyzes technical headers, audits your DNS configuration (SPF/DKIM/DMARC), and reviews email copy to identify why your messages are landing in spam.

    No, this skill is designed to work within your preferred AI chat interface; it provides expert analysis and step-by-step instructions that you then apply to your DNS provider or email platform.

    While it cannot perform live lookups, it can interpret raw DNS records and header data that you paste into the chat, providing a detailed diagnostic report on your current setup.

    This skill is built for any AI agent that supports custom system instructions or personas, making it compatible with most major LLM platforms used in this marketplace.

    A persona and 4 skills, each a plain SKILL.md file: sender setup walkthrough, spam copy audit, subject line risk checker, warmup ramp planner. The package has no scripts, templates or separate guides.

    Unlike general AI prompts, this persona is engineered to avoid 'black hat' shortcuts and focuses exclusively on long-term infrastructure health and ISP reputation standards.

    New in Sales & Lead Gen