[AccessD] email validation

Technically, you could use TCP/IP to create an SMTP session to verify an
email address.  The SMTP protocol does verify whether an email is valid on
it's domain.

Drew

	-----Original Message-----
	From:	Stuart McLachlan [SMTP:stuart at lexacorp.com.pg]
	Sent:	Sunday, January 08, 2006 5:25 PM
	To:	Access Developers discussion and problem solving
	Subject:	Re: [AccessD] email validation

	On 8 Jan 2006 at 18:12, Arthur Fuller wrote:

	> to be sure. What I wanted in those contexts was an event that
would
	> immediately attempt to send a message to the specified address,
and holler
	> at the user if it failed, placing the cursor back in the email
field (in
	> case of simple mis-spelling). I never did come to a correct method
of doing
	> this. 
	> 

	A few reasons off the top of my head why this will never work
reliably, 
	there are probably a number of other reasons as well.

	1. Emails are not instant messaging.  A recipient mail server may be

	temporarily unavailable for any number of reasons. Many outbound
servers  
	retry for up to four days to complete delivery.

	2. Many servers accept (or at least appear to accept) all messages
for a 
	domain whether the individual mailbox address is valid or not.

	3. Challenge/response systems :-(

	-- 
	Stuart


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