From: TR Shaw

> On Oct 25, 2010, at 6:46 PM, Daniel P. Brown wrote:
>> On Mon, Oct 25, 2010 at 18:38,  <> wrote:
>>> Is there any other function which checks whether this
>>> address really exists?
>>    Of course not!  Can you imagine the implications, insecurities,
>> and privacy concerns that would be associated with that?  Some
>> mailservers will confirm or deny if a local address exists, but not
>> most --- thankfully.

> Not true or else you would never get mail.

Of course it's true. Most servers will accept any email sent to a valid
domain name, then silently discard all messages that don't have valid
user names, expecting that set to be mostly SPAM. This created a new
problem where the legitimate senders no longer know when their mail
didn't get delivered due to a typo in the address.

Bob McConnell

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