R: R: What's with UCEPROTECT List?

[Giampaolo Tomassoni]

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.  You mean, a 5xx (permanent) error?   Most sites don't use permanent errors for unknown mailboxes: the rfc-suggests error code for this case is a temporary one (but maybe I didn't recall it good enough).   giampaolo