Check if email address exists (not if email addrss is valid)

from the FAQ:
http://www.aspnetmx.
com/faq.aspx

      How well does aspNetMX validate email addresses?
        Depending upon your network connection, and
techniques used,
aspNetMX does an extremely good job of validating email
addresses. When used
properly, aspNetMX will filter out all bad email addresses,
except those
that perform a hard bounce.

      What is a hard bounce?
        A hard bounce occurs when you send an email address
to a mail
server. The mail server accepts the email as a valid email,
although the
email address does not actually exist. After the SMTP
session is closed, the
mail server then sends a reply back to the 'from address' or
'reply-to'
address of the email claiming that the receiving email
address does not
really exist.

      Why do some mail servers act this way?
        Some mail servers use this technique to discourage
email harvesting.

      Will aspNetMX filter out all my bad email addresses?
        aspNetMX will filter out email addresses that are
rejected by mail
servers. Unfortunately aspNetMX cannot detect hard bounces.
aspNetMX does
not send an email, it only uses the best SMTP commands to
*attempt* to send
an email without actually sending one. Once the receiving
mail server either
accepts or denies the attempted send, aspNetMX cleanly
closes the mail
server connection, without sending an email.




----- Original Message -----
From: "Dean Cleaver" <dean.cleaverXCEPTIONSOFTWARE.COM>
To: <DOTNET-WINFORMSDISCUSS.DEVELOP.COM>
Sent: Thursday, December 28, 2006 2:33 PM
Subject: Re: [DOTNET-WINFORMS] Check if email address exists
(not if email
addrss is valid)


"not.dean.cleaverxceptionsoftware.com is a valid email
address"

No, it's not. It will bounce. So it's not foolproof.

Dino

-----Original Message-----
From: Discussion forum for developers using Windows Forms to
build apps
and controls [mailtoOTNET-WI
NFORMSDISCUSS.DEVELOP.COM] On Behalf Of
Hugh Brown
Sent: Friday, 29 December 2006 07:15
To: DOTNET-WINFORMSDISCUSS.DEVELOP.COM
Subject: Re: [DOTNET-WINFORMS] Check if email address exists
(not if
email addrss is valid)

Suits me fine.

http://aspnetmx.com/dem
o.aspx

Results
      hughdbrownyahoo.com is not a valid email address.

Christopher Frazier <chris.frazierGMAIL.COM> wrote: http://aspnetmx.com