Checking if email is valid

[Cameron Simpson]

On 02Nov2023 17:04, Chris Angelico <rosuav at gmail.com> wrote:
>On Thu, 2 Nov 2023 at 15:20, AVI GROSS via Python-list
><python-list at 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.

Hmm. IIRC...

https://datatracker.ietf.org/doc/html/rfc2821#section-4.1.1.6

I think a lot of mail receivers don't honour this one, for exactly the 
reasons above.

Cheers,
Cameron Simpson <cs at cskk.id.au>