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The European Union has implemented a new law to promote a more sustainable and circular battery industry. The law aims to improve battery durability, reuse, and recycling, as well as increase transparency and traceability throughout the battery supply chain.

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Colorado has passed a law that requires age verification for access to certain online content, shifting the process from websites to operating systems. This legislation aims to enhance protection for minors accessing potentially inappropriate material on the internet.

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The article discusses two new Go programming language tools, Junie and Claude, which help developers write modern and efficient Go code. Junie is a linter that enforces best practices, while Claude is a code formatter that ensures consistent code style.

The article discusses how OpenAI, the artificial intelligence research company, might compete with other tech giants in the future. It explores the potential challenges and opportunities OpenAI faces as it continues to develop and commercialize its AI technologies.

The article explores the potential impact of ChatGPT and other AI language models on the writing industry, arguing that the ease and accessibility of these tools have contributed to making writing more replaceable. It suggests that the rise of AI-powered writing tools challenges the traditional notion of authorship and creativity.

The article explores the growing challenge of regulating large technology companies, as they wield significant influence over public discourse and personal data. It examines the debate around the need for stronger oversight and transparency to address concerns over privacy, misinformation, and anti-competitive practices.

GenPPT.ai is an AI-powered presentation generation tool that automatically creates professional-looking PowerPoint slides based on text input. The platform utilizes natural language processing and machine learning to generate visually appealing slides with relevant content, images, and design elements.

The article discusses Flowboard, an open-source workflow management tool that enables users to create and manage workflows visually. It provides features such as task tracking, team collaboration, and customizable templates to streamline business processes.

The article explores the rare occurrence of blood clots after certain COVID-19 vaccines, providing an explanation for this phenomenon and noting that the benefits of the vaccines generally outweigh the risks for most individuals.

The article explores the recent layoffs at Block, formerly known as Square, and the leadership challenges faced by CEO Jack Dorsey as he navigates the company's restructuring efforts during a period of economic uncertainty.

The article examines the CIA and MI6's alleged intelligence findings that Russian President Vladimir Putin was planning an invasion of Ukraine as early as 2021, providing a detailed timeline of events leading up to the 2022 Russian invasion of Ukraine.

The article explores the Claude C compiler, an innovative tool that promises to revolutionize software development by automating the tedious aspects of coding and enabling developers to focus on more complex problem-solving tasks. It highlights the potential of Claude to streamline the software development process and provide insights into the future direction of the industry.

I co-founded SmartrMail (email marketing SaaS, 12K ecommerce customers, acquired 2022). When I left, I no longer had access to the sending data I'd spent years learning from, billions of sent emails, deliverability patterns, things that actually move email engagement

Cos' I don't have this data anymore, I built the best thing I could to help with the email marketing I currently do:

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my research process

Multiple sprints across all major email marketing topics. The crawler pulled 908 sources: Litmus, Klaviyo, HubSpot, Campaign Monitor, and Salesforce annual reports; practitioner blogs; academic research; platform documentation; Reddit threads; Shopify forums; and community discussions on X. From those, I extracted 4,798 discrete insights. Every claim that made it into the guide has a source. Anything that was unsourced opinion got cut.

That produced EMB v4: Over 80k words across 16 chapters. After two editorial passes, cutting duplicates, consolidating overlapping sections, removing anything that didn't earn its place it landed at 55,000 words. I reached out to all the email experts cited for their feedback too, over half contributed and made changes. I was stoked with that.

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the skill vs bible issue

The full 55K-word guide is too big for a context window. You can't just point Claude at the whole thing and expect coherent answers.

So the SKILL.md is a separate, condensed extraction: the key frameworks, benchmarks, practitioner names, and tactical thresholds that fit in context. When you ask Claude a question with the skill installed, it's drawing on a structured summary rather than trying to retrieve from a raw document dump.

but this creates a problem not solved yet: the skill and the Bible can drift. As the Bible gets updated (experts send corrections, better data emerges), the skill needs to be manually kept in sync. The obvious fix is an MCP server that connects them so changes to the Bible automatically propagate to the skill. I'll probably build that with the next big update to the bible.

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the data gap

I saw on smartmail that occasionally "conversion wisdom" or email best practise would actually not line up with our real, aggregate sending data. Eg "best time of the week to send a newsletter is 9am tue/thurs". Nope. Was absolutely a case by case solution and the rule of thumb here would often hurt email engagement. So, the weakness of this project is it's built on published research, not proprietary sending data. Published benchmarks are backward-looking, aggregated across wildly different use cases, and often produced by ESPs with an incentive to make email look good.

What I'd really want is anonymised send-level data from real campaigns. Subject line → open rate, across list sizes, industries, send times. Body structure → click rate. Flow configuration → revenue per recipient.

If anyone is working on this or has access to send-level data and wants to contribute, I'm very interested.

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the ESP integration problem

The other thing I'm frustrated by is AI connections into ESPs are still terrible. Most platforms have API coverage for basic CRUD operations but nothing close to what you'd need to actually run a campaign from Claude. You can pull subscriber counts. You can't meaningfully analyse flow performance, trigger segment rebuilds, or get real deliverability diagnostics programmatically.

A few ESPs are starting to add MCP servers (it's mentioned in Ch 14 of the guide), but it's early and patchy. Until that's solved, the skill is advisory, it can tell you what to do, it can't do it for you. That gap is worth building toward.

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what's live now

Install:

    git clone https://github.com/CosmoBlk/email-marketing-bible.git ~/.claude/skills/email-marketing-bible

MIT licensed. No paywall. No email gate. No affiliate links.

Happy to answer questions!

Hi HN, I'm the maintainer of pmxt.

With Polymarket's recent acquisition of DomeAPI to bring their infrastructure in-house, there is a sudden gap for developers building cross-market arbitrage bots, tracking whale wallets, or running quantitative models across prediction markets. If you are trading across Polymarket, Kalshi, or Limitless, you need a unified API to avoid getting locked into a single exchange's ecosystem.

pmxt is stepping in to fill that void.