Validating an email address

[Tim Williams (gmail)]

On 09/12/05, Ben Finney <bignose+hates-spam at benfinney.id.au> wrote:
>
>
> The only validation you should be doing before sending the message is
> on the domain part. Since there are records available in DNS to
> verify, you can check those. Is there an MX record? Is the address
> valid? Do the mappings both way for that record make sense?


Agreed,  BUT !!!

An MX record is not required by RFCs, a single  A record should be tried if
there are no MX records.  And the sending server's PTR doesn't have to match
its hostname(s), nor the domain in the email address

HTH :)
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