An email address is made up of parts….

Name (or other identifier)
@
Domain.

My question is.

Could a legitimate email address be aa@aa? Or does it have to have a dot.com or some other derivitive of this.

Ta

Or does it have to have a dot.com or some other derivitive of this.

Yes.

Ta, thought so.

You’ll be wanting RFC822 section 6.1

Enjoy: http://www.freesoft.org/CIE/RFC/822/42.htm

Dave

You’ll be wanting RFC822 section 6.1

I love it when you talk dirty

it needs a dot-something which is a top level domain … basically signifying what type of domain the address is.

That being said, its governed by the nameservers databases which links a name to a specific IP address … so in theory @aa could have an IP linked to it on the nameserver and data would get through.

But the nameservers are controlled , so that setup would probably never beallowed to be put on the databse.

Alfabus, I’m going to lie down now and calm down, you silver tongued charmer you!

That spec ^^^ would seem to allow domain names of just one “word”.

And according to Wiki that is the case

i.e. fred@com is legit.

http://en.wikipedia.org/wiki/Email_address#Domain_part

I love it when you talk dirty

don’t make me bring out the full S/MIME spec 🙂

allthepies – Member
That spec ^^^ would seem to allow domain names of just one “word”.

And according to Wiki that is the case

i.e. fred@com is legit.

http://en.wikipedia.org/wiki/Email_address#Domain_part

That’s actaully fred@com.

the . is the TLD

Just check it with this regex, and all will be fine:
(?:[a-z0-9!#$%&’*+/=?^_{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_{|}~-]+)*|”(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*”)@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

it needs a dot-something which is a top level domain … basically signifying what type of domain the address is.

Yeah. You’ve got either a two-letter country code TLD (eg, .uk), or a three-letter or more generic TLD (eg, .com, .info). Interestingly, it doesn’t have to be in the Latin alphabet we know and love; it could be in Arabic, for instance. Check out the URL here if you want your mind blown a little. (There’s a few of these test domains; I’ve a list somewhere.)

Anyway. Yes, for the purposes of the Internet, an email address will always be something@domain.tld, though you could theoretically set up an internal email network with whatever namespace you happened to choose I suppose.

Wouldn’t that be illegal under the RFC 822 syntax ?

That’s actaully fred@com.

the . is the TLD

Even if the spec technically allows it, it’d still have to be registered with ICANN, which it’s not. I don’t think, anyway.

I’m checking an online form at work and it allowed me to enter aa@aa as my email address. I expected it to error, but it didn’t.

The info above does help in the context of the job I’m doing.

Thanks

Regex thang

http://simonslick.com/VEAF/

Enter an Email addy and it will tell you if it’s compliant.