Re: ISO service which will return a mail domain as valid or not.

[Bdietz400 <bdietz400@xxxxxxxxx>]

Not in front of a keyboard, but I wonder if you could use the DIG command to verify the MX associated with the domain.  
--
Bryan Dietz

> On Apr 7, 2026, at 7:00 AM, Rob Berendt <robertowenberendt@xxxxxxxxx> wrote:
>
> You send an email and you get a
> Reason: 5.1.2 - Bad destination host ('000', ['DNS Hard Error looking up
> aasdfdfsdf9788asfdsf8d87f8d.com (MX): NXDomain'])
>
> You decide to get proactive and scrub a file containing all these
> destination addresses.  You want to run something like
> select customer_number, customer_name, email_address,
> email_domain_valid(email_address)
> from customer_master
> where email_domain_valid(email_address) = '0'
>
> Does anyone have something like the desired email_domain_valid?
>
> I can worry about the performance later (like grouping by domain names, a
> list of whitelisted domain names, etc)  So let's not chase that squirrel.
> --
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