frontpage.
newsnewestaskshowjobs

Made with ♥ by @iamnishanth

Open Source @Github

fp.

Ask HN: Opus 4.6 ignoring instructions, how to use 4.5 in Claude Code instead?

1•Chance-Device•1m ago•0 comments

We Mourn Our Craft

https://nolanlawson.com/2026/02/07/we-mourn-our-craft/
1•ColinWright•4m ago•0 comments

Jim Fan calls pixels the ultimate motor controller

https://robotsandstartups.substack.com/p/humanoids-platform-urdf-kitchen-nvidias
1•robotlaunch•7m ago•0 comments

Exploring a Modern SMTPE 2110 Broadcast Truck with My Dad

https://www.jeffgeerling.com/blog/2026/exploring-a-modern-smpte-2110-broadcast-truck-with-my-dad/
1•HotGarbage•7m ago•0 comments

AI UX Playground: Real-world examples of AI interaction design

https://www.aiuxplayground.com/
1•javiercr•8m ago•0 comments

The Field Guide to Design Futures

https://designfutures.guide/
1•andyjohnson0•9m ago•0 comments

The Other Leverage in Software and AI

https://tomtunguz.com/the-other-leverage-in-software-and-ai/
1•gmays•11m ago•0 comments

AUR malware scanner written in Rust

https://github.com/Sohimaster/traur
3•sohimaster•13m ago•1 comments

Free FFmpeg API [video]

https://www.youtube.com/watch?v=6RAuSVa4MLI
3•harshalone•13m ago•1 comments

Are AI agents ready for the workplace? A new benchmark raises doubts

https://techcrunch.com/2026/01/22/are-ai-agents-ready-for-the-workplace-a-new-benchmark-raises-do...
2•PaulHoule•18m ago•0 comments

Show HN: AI Watermark and Stego Scanner

https://ulrischa.github.io/AIWatermarkDetector/
1•ulrischa•18m ago•0 comments

Clarity vs. complexity: the invisible work of subtraction

https://www.alexscamp.com/p/clarity-vs-complexity-the-invisible
1•dovhyi•19m ago•0 comments

Solid-State Freezer Needs No Refrigerants

https://spectrum.ieee.org/subzero-elastocaloric-cooling
2•Brajeshwar•20m ago•0 comments

Ask HN: Will LLMs/AI Decrease Human Intelligence and Make Expertise a Commodity?

1•mc-0•21m ago•1 comments

From Zero to Hero: A Brief Introduction to Spring Boot

https://jcob-sikorski.github.io/me/writing/from-zero-to-hello-world-spring-boot
1•jcob_sikorski•21m ago•1 comments

NSA detected phone call between foreign intelligence and person close to Trump

https://www.theguardian.com/us-news/2026/feb/07/nsa-foreign-intelligence-trump-whistleblower
8•c420•22m ago•1 comments

How to Fake a Robotics Result

https://itcanthink.substack.com/p/how-to-fake-a-robotics-result
1•ai_critic•22m ago•0 comments

It's time for the world to boycott the US

https://www.aljazeera.com/opinions/2026/2/5/its-time-for-the-world-to-boycott-the-us
3•HotGarbage•23m ago•0 comments

Show HN: Semantic Search for terminal commands in the Browser (No Back end)

https://jslambda.github.io/tldr-vsearch/
1•jslambda•23m ago•1 comments

The AI CEO Experiment

https://yukicapital.com/blog/the-ai-ceo-experiment/
2•romainsimon•24m ago•0 comments

Speed up responses with fast mode

https://code.claude.com/docs/en/fast-mode
4•surprisetalk•28m ago•0 comments

MS-DOS game copy protection and cracks

https://www.dosdays.co.uk/topics/game_cracks.php
4•TheCraiggers•29m ago•0 comments

Updates on GNU/Hurd progress [video]

https://fosdem.org/2026/schedule/event/7FZXHF-updates_on_gnuhurd_progress_rump_drivers_64bit_smp_...
2•birdculture•30m ago•0 comments

Epstein took a photo of his 2015 dinner with Zuckerberg and Musk

https://xcancel.com/search?f=tweets&q=davenewworld_2%2Fstatus%2F2020128223850316274
14•doener•30m ago•2 comments

MyFlames: View MySQL execution plans as interactive FlameGraphs and BarCharts

https://github.com/vgrippa/myflames
1•tanelpoder•31m ago•0 comments

Show HN: LLM of Babel

https://clairefro.github.io/llm-of-babel/
1•marjipan200•31m ago•0 comments

A modern iperf3 alternative with a live TUI, multi-client server, QUIC support

https://github.com/lance0/xfr
3•tanelpoder•33m ago•0 comments

Famfamfam Silk icons – also with CSS spritesheet

https://github.com/legacy-icons/famfamfam-silk
1•thunderbong•33m ago•0 comments

Apple is the only Big Tech company whose capex declined last quarter

https://sherwood.news/tech/apple-is-the-only-big-tech-company-whose-capex-declined-last-quarter/
4•elsewhen•36m ago•0 comments

Reverse-Engineering Raiders of the Lost Ark for the Atari 2600

https://github.com/joshuanwalker/Raiders2600
2•todsacerdoti•38m ago•0 comments
Open in hackernews

"Email is Easy" email address quiz

https://e-mail.wtf
47•samwho•5mo ago

Comments

docsaintly•5mo ago
I think using example.com is a bit of a trick question. It is known as an example domain which is invalid for all purposes, except of course for serving as an example. :)

https://www.iana.org/help/example-domains

wredcoll•5mo ago
I've actually been wondering for a while if example.com is a valid example email address.
mdaniel•5mo ago
Well, "valid," yes, but "deliverable" thankfully, no

  $ dig MX example.com.

  ;; ANSWER SECTION:
  example.com.  3600 IN MX 0 .
Almost certainly the same for its .org .net and .example friends. There were some other TLDs that were designed for use in documentation, but I don't have the RFC in front of me right now to cite them
SoftTalker•5mo ago
Some of the other examples which are "technically valid but obsolete" I would consider safe to call invalid for practical purposes.
samwho•5mo ago
Yeah, I almost put a disclaimer at the end saying that while these examples are valid according to the spec, that has no bearing on whether they’re usable in practice. Email is the Wild West.
olddustytrail•5mo ago
Exactly. Not valid because it can't be routed.
TMWNN•5mo ago
Yes. If I'd known that other questions would also use example.com, I would have answered the first question correctly.
paulnpace•5mo ago
An explanation of the use of example.com would have informed users that addresses should be evaluated as such, otherwise, AFAICT, all of the examples provided are invalid.
sour-taste•5mo ago
Love it. Minor but question 8 should maybe be 'trailing' instead of 'tailing'?
samwho•5mo ago
Good eyes! Code is at https://github.com/samwho/e-mail.wtf if you’d like to open a PR
rpgraham84•5mo ago
would be nice if what valid means was clearly defined before the test. what the rfc's regex allows is probably the least useful way to think about email validation.
mdaniel•5mo ago
I see some of the sibling comments seem to imply that "valid" means that it's deliverable at that moment in time, which would make producing a quiz like this some nonsense because then they'd have to actually register xn--tp8h as a domain, and create an MX record for it
samwho•5mo ago
I do have a short sentence on the homepage saying I used https://github.com/jackbearheart/email-addresses as the validator for the examples. It could be more clearly defined, though.
xigoi•5mo ago
I scored 17/21 on https://e-mail.wtf and all I got was this lousy text to share on social media.
mdaniel•5mo ago
As far as I know, that emoji question due to the same reason IDN is allowed in URLs, and they even went as far as their own RFC for it https://datatracker.ietf.org/doc/html/rfc6530 (very similar to the 6532 cited repeatedly, but more important(?) because every system in between the sender and recipient needs to know about hops, whereas the recipient is the terminal node's problem

The LHS is, as far as I know, because the LHS of _all_ email addresses is "if it's deliverable", modulo the rest of the call-outs from the rest of the quiz

stavros•5mo ago
This is fun, but it feels suspiciously close to my old presentation about the exact same thing:

https://www.youtube.com/watch?v=xxX81WmXjPg

Maybe it's just a coincidence, but a shoutout would have been nice if not.

Dilettante_•5mo ago
Same guy made https://jsdate.wtf, also posted to HN, and also containing material from someone else's talk I'm pretty sure.

Edit: I was wrong!

samwho•5mo ago
Similar to this I got my examples for jsdate.wtf through reading the v8 date parsing code and experimentation. Wasn’t aware there was a talk with similar examples for JS dates, would be interested to see it.
Dilettante_•5mo ago
My bad, I was thinking about a much older talk[1], maybe something about the theme activated the same neurons. Sorry for making an accusation like that for what turns out was no reason.

[1]https://www.destroyallsoftware.com/talks/wat

samwho•5mo ago
It’s okay <3 it doesn’t surprise me that both of these topics have been covered before, and both are fairly small input spaces so there’s bound to be similarities or overlap.

I do love Gary’s “wat” talk, it was certainly part of the inspiration to make these.

samwho•5mo ago
Coincidence. I hadn’t seen this.

I got my examples mostly from looking through https://github.com/jackbearheart/email-addresses/blob/master... and reading the EBNF in RFC 5322.

Will watch your video!

samwho•5mo ago
Your talk is a lot better than my quiz.

Interestingly you say comments aren’t valid in the middle of the local part but I thought they are, and the parser I used agreed. Maybe obsolete behaviour?

I didn’t realise quotes could be dot separated but it makes sense now I look back over the EBNF! That’s really cool.

Sorry I made you think I’d stolen your content, I can totally see why you’d think that. I promise you that was the first time I watched that video.

zvr•5mo ago
There should have been questions without "@" as well...
samwho•5mo ago
Are there valid emails without an @? I’m very vaguely aware of bang paths but didn’t want to include them because they’re a bit too esoteric.
fanf2•5mo ago
Canonically postmaster is valid without a domain in SMTP. Traditionally mail messages can be composed to local users without writing domains in their addressses, and the message submission service will add domains where necessary.
zvr•5mo ago
Well, of course, in a multi-user system you can send an email to "user". Typically used for system processes to email "root" back in the day, or "postmaster" or other system accounts, as well.

Bang paths host!user or even host1!host2!user were used in the past, and I think they are still supported by most MTAs. They are definitely valid syntax for email addresses. I mean, if you're talking about quotes and parentheses, ...

tmdetect•5mo ago
Funny. I definitely knew there were some unique characteristics, but this took it to a new level.
samwho•5mo ago
Thank you <3 which one got the biggest laugh?
nocoiner•5mo ago
I chortled audibly at the goatse one.
fanf2•5mo ago
Some notes:

* Single-label domains are problematic in several ways. Traditionally they are used as local abbreviations on the assumption that TLDs can’t be mail domains – tho that’s false, because several ccTLDs have had MX records at one time or another. Still, mail software can vary in whether it might treat single-label domains as abbreviations or TLDs or both. And there’s the historical anomaly that RFC 2821’s syntax disallows single-label domains; this was a drafting mistake not an intentional change.

* Spaces around local parts are valid or not depending on which spec you are following, so question 7 is badly framed. You need to be clear whether you are parsing a mail address as in the SMTP envelope, or an address and display name as in a message header.

* Similarly, comments are not valid in SMTP so the questions about comments are also poorly framed.

* And the syntax of domain literals / address literals is specified by SMTP, so question 16 and 18 are based on not reading enough of the RFCs.

jayski•5mo ago
15/21.

I was expecting a question about simple%example1.com@example2.com.

which I remember was a useful trick when I worked as a sendmail admin in the early 2000s.

tyilo•5mo ago
Last week I created a script for finding which TLD's have MX records. Result:

    cf: ["mail.intnet.cf."]
    gp: ["ns1.nic.gp."]
    gt: ["aspmx.l.google.com.", "alt1.aspmx.l.google.com.", "alt2.aspmx.l.google.com.", "aspmx2.googlemail.com.", "aspmx4.googlemail.com.", "aspmx5.googlemail.com."]
    hr: ["alpha.carnet.hr."]
    km: ["mail1.comorestelecom.km."]
    mq: ["mx1-mq.mediaserv.net."]
    mr: ["mail.nic.mr."]
    tt: ["ASPMX.L.GOOGLE.COM.", "ALT1.ASPMX.L.GOOGLE.COM."]
    ua: ["mr.kolo.net."]
    ws: ["mail.worldsite.ws."]
    موريتانيا: ["mail.nic.mr."]
    عرب: ["your-dns-needs-immediate-attention.عرب."]
PS: Only http://uz/ seems to have a "working" HTTP server, returning the 500 status code.
vthriller•5mo ago
I'm not sure if I'd count examples with spaces and comments towards valid emails, because one could argue these are not part of the address, they're email header syntax details. Like, sure, FWS from RFC can be used somewhere in the address, but it can also be in any other header. Also, CFWS and whatnot are going to get stripped anyway by the time you'd have to deal with SMTP (see Forward-path in RFC 5321, which doesn't allow `(nonsense in parentheses)`), so I don't think they should be considered part of the valid address anyway.