Re: R: What's with UCEPROTECT List?

[Marc Perkel]

Giampaolo Tomassoni wrote: 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? Just to know, how exim's sender verification function copes with greylisting? I mean, at the first time exim attempts to check some user mailbox on a given mx with greylisting functions, it gets a 450 reply code. Does exim assumes the sender address is forged in that case? Exim sender verification is very flexible. On my setup a temp error would not cause a rejection or delay. Failures bypass sender verification. I only reject senders where the sender as been afirmatively confirmed as a bad email address.