
Email Verification API | Real-Time Validation for Developers | MailValid
Email verification API with real-time validation via syntax, domain, MX, and SMTP checks.
@sachinbapure · X
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Email verification API with real-time validation via syntax, domain, MX, and SMTP checks.
@sachinbapure · X

Verify email addresses and check domain health to improve campaign deliverability.
@mailthentic · X

Protect your email and calendar by requiring unknown senders to solve a CAPTCHA or pay a fee.
felixdoerp · HN
Hi HN, The one thing AI reliably does is generate noise. Half the tools I see launch are just machines for producing more noise across more channels. And people are starting to see this in the form of emails in their inboxes as spam filters are struggling. There used to be a useful signal in email: the effort a sender put into customizing a message was a rough proxy for how relevant it actually was. AI killed that. Now it's customized slop with the appearance of effort with none of the cost. It is painful that the open internet / open channels have been abused like this. Captchainbox applies the idea of proof-of-work to email. If a sender is willing to do a bit of work to reach you, the message is more likely to be worth your time and the sender more likely to be real. The work is a traditional captcha. You can also set a pay-to-deliver amount if you want more friction. The proceeds of the delivery payment after transaction costs go to the Internet Archive and the EFF. The tool curr

Create disposable inboxes via API to capture emails and OTPs for test automation.
@MailFixture · X

Free website security scanner checking SSL, headers, and compliance for instant trust scores and AI-guided fixes.
@MrPenetratorTP · X
MrPenetrator helps businesses monitor their website’s trust, security and performance before problems affect their visitors.

Email and productivity assistant for Google Workspace that answers with interactive widgets you approve.
u/narin_luangrath · Reddit
Solo-built an email agent where the AI literally cannot act on its own — the architecture is the pitch Building SmolMail ( https://smolmail.com ) solo for a few months. Two build decisions turned out to be the whole product: Widgets over prose. Every answer renders as a real component (calendar grid, email list, editable forms) and the model only picks the props — so the UI can't hallucinate. The calendar shows what the Calendar API returned, period. No write tool, on purpose. Email

Paste a contract address to detect Ethereum rug pulls and scams instantly.
@mik3fly__ · X
Here is mine: Check for scam before being scammed!

Temporary email service with AI features like translation, summarization, and Q&A.
ChatTempMail — AI 驱动的临时邮箱服务

Email inbox connected to your CRM, Slack, Claude and other services.
thomas_housecat · HN
I got so frustrated with all of the busywork that was building up in my email inbox that I built something better. Housecat is the first email inbox that helps you get real work done. Our email connects to the other services you actually use like your Claude, Notion, Slack, CRM and Github and makes it easy to send messages and data between them. So if you need to update the CRM with a new lead, track a Github issue or ask a question of a colleague in Slack, you can do it all from right inside of

Drop files to generate cryptographic proof they haven't changed—verified entirely in your browser.
@WiseEstSystems · X

AI-native email platform for connecting agents to inboxes via MCP, API, and CLI.
@Mailpipe_dev · X
AI-native email with human oversight

Run cold email campaigns with multi-inbox sending, reply detection, and meeting tracking.
@sendmatico · X
SendMatico helps founders, agencies, and outbound teams run cold email campaigns with multi-inbox sending, follow-ups, reply detection, and deliverability tools.