On Wed, Nov 10, 2004 at 02:18:50PM -0500, Robert Brockway wrote: > On Wed, 10 Nov 2004, Craig Sanders wrote: > > if you do have a backup MX, then you need to have the same anti-spam > > & anti-virus rules as on your primary server AND (most important!) it > > needs to have a list of valid recipients, so that it can 5xx reject > > mail for unknown users rather than accept and bounce them (known as > > "backscatter"). > > Oh you mean reject mail for unknown recipients rather than bounce the > mail[1]. Ok, I can see why you are suggesting it but it is an RFC > violation.
so are most anti-spam and anti-virus methods. theory is fine, but pragmatic reality sometimes dictates divergence from an idealist theory. > Not that I'm necessary saying not to do it but one must walk > towards RFC violations fully aware of the fact (for the benefit of those > reading along at home). true. you've got to know the rules before you break them. > [1] I thought you were suggesting the MTA should drop mail from unknown > senders - a type of brutal white list :) not at all. that wouldn't make much sense, and it wouldn't be very useful. craig -- craig sanders <[EMAIL PROTECTED]> (part time cyborg) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]