On Fri, Mar 1, 2013 at 10:24 AM, <m.roth at 5-cent.us> wrote: > > Blocking an open relay should be done *only* on human investigation, to > see whether that's the majority of what's coming out of there, and > consideration of what the "relay" is, whether it's a known source, or an > innocent large provider. The argument on the other side of this is that the blacklist maintainers don't really block anything, they just make a lookup service available that corresponds to certain reported or potential problems. It is the mail delivery service provider that makes the decision to reject mail (or not) on behalf of the recipient and no one forces them to use the blacklists. If the recipient doesn't want this, they can use some other mail service or (sometimes) set up whitelists. A couple of decades ago I would have agreed that no one should reject but I think we've learned that you can't trust everyone with an IP address. -- Les Mikesell lesmikesell at gmail.com