Publicsuffix.org is a wonderful resource for the tlds

But then the question of what a valid domain takes some interesting turns.

Validate the mx and it is a parking domain whose mail traffic probably feeds a 
set of spamtraps?

Or one of those trashmail type places that let you create an address that is 
valid for a bare 15 minutes?

Or where the mx points to local host, a cname, or is broken in some other 
manner?

--srs
________________________________
From: mailop <[email protected]> on behalf of Luis E. Muñoz via mailop 
<[email protected]>
Sent: Thursday, May 26, 2022 8:04:48 PM
To: [email protected] <[email protected]>
Subject: Re: [mailop] Help with identifying invalid email domains

On 26 May 2022, at 6:18, Ken O'Driscoll via mailop wrote:

> People should be validating email input fields as a matter of course.

And then, do it correctly. One of my pet peeves is finding out forms that still 
think that there is no such thing as a .click email address. Tends to work 
better for TLDs 4 characters or less in length.

Best regards

-lem
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