lots of mucking around...yes,
but you only have to get it right once. then you save your
code and you're
done... of course only until the next revision to SMTP comes
out.. 
-----Original Message-----
From: Discussion forum for developers using Windows Forms to
build apps
and controls [mailto OTNET-WI
NFORMS DISCUSS.DEVELOP.COM]On Behalf Of
Adrian Martin
Sent: Monday, December 18, 2006 11:34 AM
To: DOTNET-WINFORMSDISCUSS.DEVELOP.COM
Subject: Re: [DOTNET-WINFORMS] Check if email address exists
(not if
email addrss is valid)
Perhaps impossible is a bit too strong a statement to make!
- But after
reading up on the "RCPT TO" message - there are
many problems with it :-
you have to rely on all the mail systems involved responding
in a
reasonable amount of time.....which is up to the mail system
implementation to decide.
None of the major online services I use, use this method( as
far as I
can tell ) - The Validation email method is used.
Its also a hell of a lot of mucking around.....
KISS http://en
.wikipedia.org/wiki/KISS_principle
-----Original Message-----
From: Discussion forum for developers using Windows Forms to
build apps
and controls [mailtoOTNET-WI
NFORMSDISCUSS.DEVELOP.COM] On Behalf Of
Adam Tuliper
Sent: 18-December-2006 16:19
To: DOTNET-WINFORMSDISCUSS.DEVELOP.COM
Subject: Re: Check if email address exists (not if email
addrss is
valid)
Not impossible - most mail systems you can check for this
without
sending an
email by setting up the initial session using HELO and RCPT
TO.
At this point you will receive a mailbox unknown or no error
and can
then
disconnect.
-----Original Message-----
From: Discussion forum for developers using Windows Forms to
build apps
and
controls [mailtoOTNET-WI
NFORMSDISCUSS.DEVELOP.COM] On Behalf Of
Adrian
Martin
Sent: Monday, December 18, 2006 1:58 AM
To: DOTNET-WINFORMSDISCUSS.DEVELOP.COM
Subject: Re: [DOTNET-WINFORMS] Check if email address exists
(not if
email
addrss is valid)
It's impossible to just check if a mailbox exists without
sending an
email and receiving a response.
(Think of the implication for spammers.)
You have to create a send confirmation email with a link or
reply to
address that confirms the account.
-----Original Message-----
From: Discussion forum for developers using Windows Forms to
build apps
and controls [mailtoOTNET-WI
NFORMSDISCUSS.DEVELOP.COM] On Behalf Of
Paul ten Brink
Sent: 18-December-2006 09:14
To: DOTNET-WINFORMSDISCUSS.DEVELOP.COM
Subject: Check if email address exists (not if email addrss
is valid)
Hi,
Does anyone know if there is a serivce, a third-party
component or some
example code to check if an email address exists?
I do not mean to check if an email addrss is valid, I know
how to do
that
using regular expressions. But even if an email address is
syntactically
valid, it need not exist.
Googling gives an overflow of irrelevant hits about users
that supplied
a
non-existing email address... :-(
(Cross-posted on DotNet-Web)
Thanks in advance,
Paul ten Brink
paul.ten.brinkphilips.com
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