Jake Vickers wrote:
David Sánchez Martín wrote:
You asked for opinions, and this is mine.
Of course, I asked for opinions, specially because
I used not to be a big fan of graylisting.
Giving that spamdyke uses a slightly different approach to
Graylisting to that I knew, I thought it could be
interesting.
I hopefully give it a try.
Regards.
;) It should be obvious that I'm not a big fan.I've always greylisted by
IP - after the third successful delivery after greylisting the IPs are
allowed for 48 hours. If they do not send anything in 48 hours, they are
greylisted again. If they do, the 48 timer resets.
The biggest killer for spam for me is rDNS checking. I'm thinking about
making it default in the next version of QMT (version 2.x) - I'll run a
poll beforehand first to make sure it's what the community wants.
Make sure to report back your results though. I'd be curious as to how
much it decreases spam in your environment. Provide some metrics as well
(number of domains, users, emails per day, etc.)
Just to be clear, spamdyke includes quite a variety of anti-spam
measures, including greylisting, various rDNS checks, and others. Each
feature is tailorable, so it's easy to configure a variation that suits
your fancy. Note, beginning with version 4 each virtual domain can be
configured independently.
I agree with Jake that rDNS checks appear to be catching the lions share
of spam (with spamdyke). This observation isn't 'absolute' though, as
rDNS checks are done early in the process (at least with spamdyke). If
an rDNS filter rejects the session, there's no way of knowing if other
checks would have rejected the session or not.
I think it'd be interesting to customize a version of spamdyke (for
analysis only) that runs through all the filters and logs appropriate
messages so that analysis could be done on the effectiveness of various
filters. Personally, I don't have that much spare time. :(
--
-Eric 'shubes'
---------------------------------------------------------------------------------
Managed Qmailtoaster servers are now available
Visit http://qmailtoaster.com/QMTManaged.html to order yours today!
Qmailtoaster is sponsored by Vickers Consulting Group
(www.vickersconsulting.com)
Please visit qmailtoaster.com for the latest news, updates, and packages.
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
