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DEV Community • 2026-07-29 02:21

Gmail 550 5.7.26 반송 오류 해결: SPF·DKIM 점검 체크리스트

Gmail로 메일을 보냈는데 550 5.7.26 오류와 함께 반송됐다면 수신자 주소보다 발신 도메인 인증부터 확인해야 합니다. 대표적인 반송 문구는 다음과 같습니다. 550-5.7.26 Your email has been blocked because the sender is unauthenticated. Authentication results: DKIM = did not pass SPF [example.com] with ip: [발송 서버 IP] = did not pass 이 오류는 Gmail이 현재 메일을 보낸 서버를 해당 도메인의 정상 발송자로 확인하지 못했다는 뜻입니다. 가장 빠른 해결 순서는 반송문에서 검사 대상 확인 → SPF 점검 → DKIM 점검 → 새 메일 재시험입니다. ...

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DEV Community • 2026-07-29 02:17

The Governed Execution Gateway: Securing MCP Servers and Tool Egress Proxies

The Perimeter Gap in Model Context Protocol (MCP) As the Model Context Protocol (MCP) rapidly becomes the industry standard for connecting LLMs to local filesystems, SaaS platforms, and enterprise databases, platform engineering teams face a new security boundary. Connecting an autonomous AI agent directly to an unmonitored MCP server or external API gateway introduces severe enterpris...

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DEV Community • 2026-07-29 02:12

Why One RAG Wasn't Enough: Building a Multi-RAG Pipeline for Jira Backlog Analysis

Large language models are only as good as the context you give them. While building an LLM-powered Jira Backlog Analyzer, I learned that simply adding Retrieval-Augmented Generation (RAG) wasn't enough. The real breakthrough came from treating different types of project knowledge as different kinds of organizational memory. When Good Recommendations Aren't Useful One of the goals of my...

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Hacker News • 2026-07-29 02:12

Show HN: AiTextToHandwriting] – Text to Handwriting Converter

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Hacker News • 2026-07-29 02:11

Show HN: SeaTicket – Duplicate Bug Finder for GitHub

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DEV Community • 2026-07-29 02:10

I Tracked Every Visitor for 24 Hours. A 1975 Biology Paper Explained the Results.

Yesterday I pulled every single event my analytics recorded for one full day and read it line by line. Not a dashboard summary — the raw per-user event stream for all 50 sessions. Here's what a day of "traffic" actually looks like for a small SaaS: Sessions recorded 50 Traceable to a known bot pattern 34 Plausibly human 16 (one of which was me) Signed up 5 Paid 1 The interes...

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𝚓𝚊𝚟𝚊𝚜𝚌𝚛𝚒𝚙𝚝 • 2026-07-29 02:09

Spent weeks manually forwarding files on Telegram, so I built an open-source bot to automate it

A few months ago, I needed to share files with people who weren't in my Telegram groups. My workflow was a nightmare: Manually forwarding each file to every user one by one. Or adding each person to the group where the files were stored (and then dealing with permissions, people leaving, etc.). It was tedious, didn't scale, and wasted so much time. So, as my first serious project with node-telegra...

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Hacker News • 2026-07-29 02:08

Show HN: MegaDSP an effects plugin for DAWs with 50 effects

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DEV Community • 2026-07-29 02:08

The parts of building an MCP server that the tutorials skip

Building your first Model Context Protocol server takes about twenty minutes. The official quickstart is genuinely good: npm install, register a tool, connect a stdio transport, and Claude or Cursor can call your code. Hello, world. Then you try to make it something other people can actually use, and you fall off a cliff. I know the cliff is real because someone measured it. An April 2026 scan o...

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DEV Community • 2026-07-29 02:03

Multi-currency affiliate commissions on Stripe: which amount do you actually owe?

If your customers pay in their own currency and you pay affiliates in yours, every payment carries two different amounts. Pick the wrong one and every commission you calculate is quietly wrong. Two amounts, two currencies Stripe calls the currency the customer is charged in the presentment currency, and the currency that lands in your account the settlement currency. When they differ, ...

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Hacker News: Front Page • 2026-07-29 01:56

Chip stocks slide in US and Asia as AI jitters rattle investors

Article URL: https://www.bbc.com/news/articles/cly8zng43npo Comments URL: https://news.ycombinator.com/item?id=49092549 Points: 9 # Comments: 1

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DEV Community • 2026-07-29 01:53

7 Lessons I Learned While Building an Open-Source React Component Library

A few weeks ago, I started building Motoko UI, an open-source React component library. The goal sounded simple: build beautiful, reusable components. The reality was very different. Here are seven lessons I've learned so far. 1. Building Components Is the Easy Part The first few components took only a couple of days. The documentation took longer. The installation flow took longer...

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Hacker News: Front Page • 2026-07-29 01:49

LearnVector – Andrew Ng's AI company building one‑to‑one learning experiences

Article URL: https://learnvector.ai/ Comments URL: https://news.ycombinator.com/item?id=49092499 Points: 8 # Comments: 2

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DEV Community • 2026-07-29 01:49

I Built Another React UI Library — Here's Why

If you've been building React apps for a while, you've probably had the same thought: "Not another React UI library..." Honestly, I had it too. The ecosystem already has amazing projects like shadcn/ui, Magic UI, Aceternity UI, Origin UI, and many others. So why would anyone build another one? It Started With Copying the Same Components Every new project looked familiar. I neede...

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DEV Community • 2026-07-29 01:41

8 Developer Tool Comparisons You Should Actually Read Before You Commit (2026)

Picking a dev tool by vibes ("everyone uses X") works until it doesn't — usually right after you've built three months of workflow around it. Below are eight comparisons worth reading in full before you commit budget or migration effort, covering the tools developers actually get stuck choosing between in 2026. Each summary below is the short version. Full breakdowns (pricing tiers, security/comp...

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Hacker News • 2026-07-29 01:38

Show HN: MD Flow – native macOS/iOS app for browsing and reading Markdown files

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DEV Community • 2026-07-29 01:35

React usePrevious Hook: Track Previous State & Props (2026)

React usePrevious Hook: Track Previous State & Props (2026) React gives you the current value of state and props on every render — and no built-in way to ask what the value was before. So everyone copies the same ten-line recipe: stash the value in a ref inside useEffect, return ref.current. It works in the demo, ships to production, and then one day a "count went up ↑" indicator st...

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DEV Community • 2026-07-29 01:33

Governing the Agentic Population

One of the biggest governance concerns that I've heard centers around "identity" for agents. Understanding that agents themselves can be fully autonomous like humans, they do need identification similar to humans. There is a requirement to verify that they are the agent that they say they are. There's a requirement that not every agent should have access to every tool the MCP servers have to offer...

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Lobsters • 2026-07-29 01:30

Lobste.rs on Spinel

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DEV Community • 2026-07-29 01:16

Engineering Reliable Pagination for Public TikTok Data

TikTok's public web endpoints do not always return the page size an application requests. One route may return a small native window, another may underfill a page even though more data exists, and a cursor may represent more than a simple numeric offset. That becomes a production problem quickly: count can disagree with the number of returned records. An application can skip items by calculati...

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