Chad Leigh -- Shire.Net LLC wrote:
> 
> Yes it is.  If someone provides email services, they accept the  
> responsibility for that email address and accept responsibility for  
> their servers being set up according to RFCs.  If a provider supports  
> email addresss [EMAIL PROTECTED] then part of that support is to verify  
> that the address is a valid address.

Um, no. The RFC explicitly allows for sites refusing to support address
verification. See RFC2821, section 7.3. The RFC-blessed mechanism for
address verification is the VRFY command, and sites are perfectly within
their rights to return 252 (ie: VRFY not allowed) for all VRFY requests.
Using RCPT TO: to hack verification on a server that has made a policy
decision to disable VRFY is an abuse.

- Marc

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