On 2012-05-27, David Diggles <da...@elven.com.au> wrote: >> What do you mean by "running in blacklist mode" ? >> Which settings are different from Grey trapping ? >> Are Openbsd mailing list the only list or mail you have problems with ? >> >> /Hasse > > By blacklist mode, I mean this: > > spamd -b > spamd-setup -b > > pf.conf: > table <spamd> persist > pass in on egress proto tcp from <spamd> to any port smtp \ > rdr-to 127.0.0.1 port spamd > > The OpenBSD mailing list was not the only smtp server I was having > problems with. > > Others included: > > 1. test email from my work account > 2. business email from a wholesaler I have been organising purchase with > > For sake of 2. I need to play safe for the time being, and suffer a > few extra incoming spams a day. Once I have that sorted out, I will > be ready to try greylisting again.
Greylisting behaves a bit differently when used on a low-volume mail server compared to a large campus/organisation mail system where most of the big providers will be constantly auto-whitelisted due to the volume of mail they're sending (i.e. big sites get a lot more inbound mail so the problem mailhosts tend to stay in the database at most times). For the smaller setups I've built when I used greylisting I often needed to maintain separate whitelists. The only actively-maintained public whitelist I know of (dnswl.org) is only usable via DNS queries unless you pay for high volume access (and spamd doesn't support doing this via DNS lookups), so you are stuck with an outdated public list, and/or manual listings. Not sure if these particular ones are still a problem, but here are examples of some senders I had problems with at various times in the past (excessive delays or retries which were too slow to get past greylisting) : amazon, aol, bigfish, ebay, gmail, messagelabs, orange, paypal, postini, yahoo. Now I either use dnswl to exempt known problem hosts from greylistikg (with some manual whitelists on top; not done via spamd) - or in several cases just stopped using greylisting altogether.
