Re: RegularExpressionValidator and fake email addresses

Thank you, Patrick. I will google for this command and see what I could do
with it...
/James

On 5/24/07, Patrick Steele <[email protected]> wrote:
>
> You can't.  You can use regex to make sure the email address is
> formatted properly, but to be 100% sure it's a valid address, you need
> to send an email and see if it bounces.
>
> You could get tricky and check the domain's MX record to see what server
> is handling mail for the domain.  And then try and connect on port 25
> (which may not be open or it may be running on a different port) and
> then see if the mail server supports "RCPT TO" (which it may not) and
> then hope that RCPT TO provides meaningful response (it might always
> return an "invalid" response to prevent spammers from pre-checking an
> email address before they send out their bulk crap).
>
> ---
> Patrick Steele
> http://weblogs.asp.net/psteele
>
>
> -----Original Message-----
> From: Discussion of building .NET applications targeted for the Web
> [mailto:[email protected]] On Behalf Of James Hearne
> Sent: Thursday, May 24, 2007 10:34 AM
> To: [email protected]
> Subject: Re: [DOTNET-WEB] RegularExpressionValidator and fake email
> addresses
>
>
> No, this isn't applicable. I don't want to send out any email. I just
> want to check if the provided email address does exist or not. How can I
> do that?
>
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