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devel / comp.lang.python / Re: Checking if email is valid

SubjectAuthor
* Re: Checking if email is validSimon Connah
`* Re: Checking if email is validJon Ribbens
 +- Re: Checking if email is validChris Angelico
 `- Re: Checking if email is validSimon Connah

1
Re: Checking if email is valid

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From: simon.n.connah@protonmail.com (Simon Connah)
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Subject: Re: Checking if email is valid
Date: Thu, 02 Nov 2023 06:42:57 +0000
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 by: Simon Connah - Thu, 2 Nov 2023 06:42 UTC
Attachments: "signature.asc" (application/pgp-signature)

>

> On 2023-11-01, Simon Connah via Python-list python-list@python.org wrote:
>

> > I'm building a simple project using smtplib and have a
> > question. I've been doing unit testing but I'm not sure how to check
> > if an email message is valid.
>

>

> Send an e-mail using it? If the right person gets the e-mail, then
> it's valid?
>

> > Using regex sounds like a bad idea to me and the other options I
> > found required paying for third party services.
> >

> > Could someone push me in the right direction please? I just want to
> > find out if a string is a valid email address.
>

OK. It is going to take me some time to get round to every reply here so please bear with me.

Basically I'm writing unit tests and one of them passess in a string with an invalid email address. I need to be able to check the string to see if it is a valid email so that the unit test passess.

>

> You'll have to define "valid". Valid syntactically according to
> <what>? Will be accepted by an SMTP server somewhere? Corresponds to
>

> a real person?
>

> Make sure it has an '@' in it. Possibly require at least one '.'
> after the '@'.
>

> Trying to do anything more than that is just wasting your time and
> annoying the mule.
>

Valid as in conforms to the standard. Although having looked at the standard that might be more difficult than originally planned.

Simon.

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Re: Checking if email is valid

<slrnuk73qr.73m.jon+usenet@raven.unequivocal.eu>

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From: jon+usenet@unequivocal.eu (Jon Ribbens)
Newsgroups: comp.lang.python
Subject: Re: Checking if email is valid
Date: Thu, 2 Nov 2023 12:00:27 -0000 (UTC)
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 by: Jon Ribbens - Thu, 2 Nov 2023 12:00 UTC

On 2023-11-02, Simon Connah <simon.n.connah@protonmail.com> wrote:
> Valid as in conforms to the standard. Although having looked at the
> standard that might be more difficult than originally planned.

Yes. Almost nobody actually implements "the standard" as in RFC 2822
section 3.4.1 (which can contain, for example, non-printable control
characters, and comments), nor is it particularly clear that they
should. So while checking against "the spec" might sound right, it's
highly unlikely that it's what you actually want. Would you really
want to allow:

(jam today) "chris @ \"home\""@ (Chris's host.)public.example

for example? And would you be able to do anything with it if you did?

Re: Checking if email is valid

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From: rosuav@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: Checking if email is valid
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 by: Chris Angelico - Fri, 3 Nov 2023 00:44 UTC

On Fri, 3 Nov 2023 at 07:17, Jon Ribbens via Python-list
<python-list@python.org> wrote:
>
> On 2023-11-02, Simon Connah <simon.n.connah@protonmail.com> wrote:
> > Valid as in conforms to the standard. Although having looked at the
> > standard that might be more difficult than originally planned.
>
> Yes. Almost nobody actually implements "the standard" as in RFC 2822
> section 3.4.1 (which can contain, for example, non-printable control
> characters, and comments), nor is it particularly clear that they
> should. So while checking against "the spec" might sound right, it's
> highly unlikely that it's what you actually want. Would you really
> want to allow:
>
> (jam today) "chris @ \"home\""@ (Chris's host.)public.example
>
> for example? And would you be able to do anything with it if you did?

If by checking against the spec you mean "sending an email to it with
a code or magic link", then.... sure, allow that! It's still short
enough to fit on one line, even. Seems fine to me.

Of course, since that one is in the .example TLD, it's not actually
going to succeed, but now I'm curious whether you could craft a mail
server that mandates the Queen's rule of "jam tomorrow, jam yesterday,
but never jam today". That part is technically a comment, but it's a
clear violation of a royal decree, so that should cause the email to
bounce. It's jam every OTHER day, and today isn't any OTHER day.

ChrisA

Re: Checking if email is valid

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From: simon.n.connah@protonmail.com (Simon Connah)
Newsgroups: comp.lang.python
Subject: Re: Checking if email is valid
Date: Sat, 04 Nov 2023 09:01:32 +0000
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 by: Simon Connah - Sat, 4 Nov 2023 09:01 UTC
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>

>

> On 2023-11-02, Simon Connah simon.n.connah@protonmail.com wrote:
>

> > Valid as in conforms to the standard. Although having looked at the
> > standard that might be more difficult than originally planned.
>

>

> Yes. Almost nobody actually implements "the standard" as in RFC 2822
> section 3.4.1 (which can contain, for example, non-printable control
> characters, and comments), nor is it particularly clear that they
> should. So while checking against "the spec" might sound right, it's
> highly unlikely that it's what you actually want. Would you really
> want to allow:
>

> (jam today) "chris @ \"home\""@ (Chris's host.)public.example
>

> for example? And would you be able to do anything with it if you did?

As I said in another post it would be interesting to see what broke when you tried to use an esoteric email address in the wild. Maybe when I'm bored :D.

Simon.

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devel / comp.lang.python / Re: Checking if email is valid

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