Works with the AI tools you already use
Email Deliverability Doctor — Bundle
by GarphenGate
Diagnose email delivery issues, fix DNS authentication records, and clean up high-risk sending habits.
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See it in action
You say
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?
Your agent does
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.
What you get
About this skill
The problem
Your legitimate sales or marketing emails are landing in the spam folder, but you cannot figure out if the issue is your DNS records, your list quality, or your copy. Generic advice to "just write better content" fails to address the underlying technical and behavioral triggers that alert ISP bodyguards.
What it does
- Analyzes email headers and bounce messages to diagnose technical configuration failures.
- Explains SPF, DKIM, and DMARC setups with step-by-step verification checklists for domain admins.
- Identifies high-risk patterns in email drafts that trigger probabilistic spam filters before you hit send.
- Audits list-building methods to ensure sending habits align with provider reputation requirements.
Why this beats prompting it yourself
Most LLMs will try to help you "bypass" filters or use "spam-proof" tricks that actually damage your long-term reputation. This skill is hard-coded to ignore growth-hacker shortcuts, focusing instead on the diagnostic rigor of a deliverability engineer to fix root causes in your infrastructure and engagement signals.
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.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Creator
34 skills on Agensi
GarphenGate is an AI and cybersecurity company, but you'll find us building all kinds of things whatever solves a real problem. The security background still shows up in how we work everything we release is tested properly, documented clearly, and built like someone is actually going to depend on it.
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