I guess I should have asked my question more concretely: is any of the backbone traffic so time-sensitive that temporarily bouncing it will cause Listserv to break? I'm not only concerned for my own server but how it might affect the backbone traffic. -a > -----Original Message----- > From: LISTSERV give-and-take forum > [mailto:[log in to unmask]] On Behalf Of [log in to unmask] > Sent: Friday, June 24, 2005 12:31 PM > To: [log in to unmask] > Subject: Re: Effects of Graylisting on Listserv > > "LISTSERV site administrators' forum" <[log in to unmask]> > wrote on 06/24/2005 11:31:22 AM: > > > We've recently put a graylisting spam filter at the edge of our > > campus network, but at my request the Listserv was left outside the > > filter because I was concerned that graylist processing of all the > > traffic coming in to the server would introduce delays that would > > somehow harm Listserv. > > > > Has anyone out there put their Listserv behind a graylisting spam > > filter? The Listserv server has been getting hit pretty hard by > > phishing scams lately, which seem to be coming in under Listserv's > > net-wide spam radar. Currently our graylist is catching these spams > > but a few of them always seem to leak in through Listserv. I'd like > > to have Listserv moved behind the graylist filter if it won't harm > > the operations of the server. We are a backbone server running in > > networked mode. > > Our spam filter does greylisting. I do not have the listserv > behind it > though. I didn't want to block any legit mail from the > lists. Spam on > the lists has not been a complaint here. > > Any non-braindead mail server should not have an issue with > greylisting. > There are a few braindead servers out there. Groupwise, at least some > versions, have a problem depending on when the tempfail is > issued. If it > is issued after the recipient, and every RCPT TO: is > tempfailed, it would > return the message as undeliverable. CanIt (http://canit.ca) offers a > setting to delay the tempfail until after the DATA phase as a > work around. > > I ran into one other instance with a mail security system that had > trouble, but it was fixed quickly once it was reported to the vendor. > > Can you set up an alternate name in DNS for your listserv and > route that > through the greylisting spam filter to test? > >