Everyone knows what an email address is, right? (Quiz)
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But they will work, and according to the spec, you have to build your system so that it can handle those cases. Obsolete doesn't mean incorrect or invalid, just a "you shouldn't do this any more".
Obsolete Syntax
Earlier versions of this standard allowed for different (usually more
liberal) syntax than is allowed in this version. Also, there have
been syntactic elements used in messages on the Internet whose
interpretation have never been documented. Though some of these
syntactic forms MUST NOT be generated according to the grammar in
section 3, they MUST be accepted and parsed by a conformant receiver.Some of those "obsolete" things are outright blocked for specific reasons. For example, routing addresses through multiple servers. It was abused by spammers, so it's almost always denied these days.
Looks like this:
<@[email protected]:[email protected]> -
Yeah I feel like the correct answer for anything obsoleted by a more recent RFC should be "Invalid".
Complaints about the quiz? Send them to
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Question 5 is incorrect,
name@exampleis a fully valid email address, even after RFC 2822The spec of RFC 2822 defines an address (3.4.1) as:
local-part "@" domaindomainis defined (3.4.1) as:domain = dot-atom / domain-literal / obs-domaindot-atomis defined (3.2.4) as:dot-atom = [CFWS] dot-atom-text [CFWS] dot-atom-text = 1*atext *("." 1*atext)1*atextmeaning at least 1 alphanumeric character, followed by*("." 1*atext)meaning at least 0"." 1*atext
If tomorrow, google decided to use its
googletop-level domain as an email domain, it would be perfectly valid, as could any other company owning top-level domainsGoogle even owns a
gmailTLD so I wouldn't even be surprised if they decided to use itI don't know if they changes the answer to the question, but it now says
name@exampleis valid. -
I don't know if they changes the answer to the question, but it now says
name@exampleis valid.It says valid but obsolete, which sounds like a contradiction to me.
This is technically valid but considered obsolete. RFC 822 allowed domains without dots, but RFC 2822 made this obsolete.
Do email suffix not indicate a different domain like .org and .com for websites?
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I scored 13/21 on https://e-mail.wtf/ and all I got was this lousy text to share on social media.
5/21 for me LoL
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I didn't do that but got 14 anyway.
Same. I answered what i thought was correct and got 14!
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I don't know if they changes the answer to the question, but it now says
name@exampleis valid.It does say it's valid, but also that it's obsolete, and while the RFC does define valid but obsolete specs, there is nothing defining domains without a dot as obsolete, and it is in fact defined in the regular spec, not the obsolete section
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Thanks to RFC 6532, Zalgo text is a-okay.
hmmm...
Yay! You're average! Time to start making plans for what you'll do when an LLM takes your job.
I already have plans.
And they are ...
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::: spoiler My top five from this (all valid):
- ":(){␣:|:&␣};:"@example.com # fork bomb
@
and poop@[]- "@"@[@]
- c̷̨̈́i̵̮̅l̶̠̐͊͝ȁ̷̠̗̆̍̍n̷͖̘̯̍̈͒̅t̶͍͂͋ř̵̞͈̓ȯ̷̯̠-̸͚̖̟͋s̴͉̦̭̔̆̃͒û̵̥̪͆̒̕c̸̨̨̧̺̎k̵̼͗̀s̸̖̜͍̲̈́͋̂͠@example.com
- fed-up-yet@␣example.com␣ # ␣ = whitespace
:::
TIL that emoji transcend spoilers.
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Pretty much everything I've seen in e-mail is needlessly complicated and weird. So of course addresses are as well.
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It does say it's valid, but also that it's obsolete, and while the RFC does define valid but obsolete specs, there is nothing defining domains without a dot as obsolete, and it is in fact defined in the regular spec, not the obsolete section
I see what you mean, I'm with you now.
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Two of my "favorite" features it didn't even touch on. You can have nested comments:
foo(one(two(three(four(five(six(seven)))))))@example.comThis will actually fail on that big email regex that gets copied around (originally from Mastering Regular Expressions in 1997), because it can only handle comment nesting to a depth of six. It is actually possible to do indefinite nesting now with recursive regex, but it was developed before that feature existed.
RFC822 also allows routing addresses through multiple servers:
<@[email protected]:[email protected]>But this is almost always denied on modern email servers because it was abused by spammers.
The routing feature is so cursed XD
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I don't think it really matters what the standard is, because you'll be completely limited by some 25 year old bit of Regex from Stack Overflow that every web developer ever has implemented into their form sanity checks.
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I don't think it really matters what the standard is, because you'll be completely limited by some 25 year old bit of Regex from Stack Overflow that every web developer ever has implemented into their form sanity checks.
The main one that gets passed around will match the weirdness fine. In fact, it probably matches things you don't want, anyway.
A signin/registration form really only needs to do sanity checks to get rid of obviously bad addresses. You'll have to send a round-trip email confirmation message to make sure the email is real, anyway, so why bother going into great detail? Just check that there's an '@' symbol and a dot in the domain. Most of the rest is wanking off.
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::: spoiler Tap for spoiler
Email addresses can have comments?!
:::wrote last edited by [email protected]Nested comments. RFC822 had a whole bunch of bad ideas in it, but nobody thought much of it at the time. Most programming languages don't even do nested comments, because they want to filter them out with a simple lexer before the grammar ever sees it.
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The main one that gets passed around will match the weirdness fine. In fact, it probably matches things you don't want, anyway.
A signin/registration form really only needs to do sanity checks to get rid of obviously bad addresses. You'll have to send a round-trip email confirmation message to make sure the email is real, anyway, so why bother going into great detail? Just check that there's an '@' symbol and a dot in the domain. Most of the rest is wanking off.
A domaine without tld (me@home) is a valide address.
I saw an email server being used as a mqtt-like server this way (it is very old and predate those software). -
A domaine without tld (me@home) is a valide address.
I saw an email server being used as a mqtt-like server this way (it is very old and predate those software).An address without a domain is irrelevant for a signin/registration form. Which is like 90% of the code being written in the wild to validate addresses.
If you're writing an email server, then you need to care about all these details. Most of us never will.
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I don't care who the IRS sends, I am not validating emails with spaces on them.
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I got 13/21. I mean thats not bad
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What if we
@ ..? 🤭
