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

SubjectAuthor
* Re: Checking if email is validChris Angelico
`- Re: Checking if email is validAlan Bawden

1
Re: Checking if email is valid

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From: ros...@gmail.com (Chris Angelico)
Newsgroups: comp.lang.python
Subject: Re: Checking if email is valid
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 by: Chris Angelico - Thu, 2 Nov 2023 06:04 UTC

On Thu, 2 Nov 2023 at 15:20, AVI GROSS via Python-list
<python-list@python.org> wrote:
>
> Yes, it would be nice if there was a syntax for sending a test message sort
> of like an ACK that is not delivered to the recipient but merely results in
> some status being sent back such as DELIVERABLE or NO SUCH USER or even
> MAILBOX FULL.
>

Yes, it would! Spammers would be able to use this syntax to figure out
exactly which addresses actually have real people connected to it. It
would save them so much trouble! Brilliant idea.

ChrisA

Re: Checking if email is valid

<86pm0su0r1.fsf@williamsburg.bawden.org>

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From: ala...@csail.mit.edu (Alan Bawden)
Newsgroups: comp.lang.python
Subject: Re: Checking if email is valid
Date: Thu, 02 Nov 2023 02:29:06 -0400
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 by: Alan Bawden - Thu, 2 Nov 2023 06:29 UTC

Chris Angelico <rosuav@gmail.com> writes:

On Thu, 2 Nov 2023 at 15:20, AVI GROSS via Python-list
<python-list@python.org> wrote:

> Yes, it would be nice if there was a syntax for sending a test
> message sort of like an ACK that is not delivered to the recipient
> but merely results in some status being sent back such as
> DELIVERABLE or NO SUCH USER or even MAILBOX FULL.

Yes, it would! Spammers would be able to use this syntax to figure out
exactly which addresses actually have real people connected to it. It
would save them so much trouble! Brilliant idea.

That sounds like the SMTP "VRFY" command. And spammers _did_ abuse it
in exactly this manner. And so pretty much every mail server in the
world disabled VRFY sometime in the 90s.

- Alan

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