Re: What's with UCEPROTECT List?

[Peter H. Lemieux]

Marc Perkel wrote:
Sender Verification is an Exim trick. What it does is start a sequence 
where my server starts to send an email back to the sender address to 
see if it's a real email account. But I do a quit after the rctp to: 
command. If the receiving end says the user doesn't exist then I block 
the email.

My incoming servers know literally nothing about which users have valid 
addresses and which do not.  All these servers do is accept or reject 
inbound mail based on a (long) list of SMTP-level rules and forward the 
messages that are accepted to another machine for SA and virus scanning.

If sender verification requires that the incoming server have a complete 
list of valid mailboxes, it's going to fail miserably here.  I don't see 
anything in the RFCs that makes my configuration non-compliant, do you?