When I first ran postfix, on my own machine instead of having my mail hosted
by an ISP, the set up was as it came 'out of the box' - I was absolutely
swamped by spam, probably one every second or two - and I almost panicked
when I saw what a horrendous volume of crap I was recieving. At first I
tried to handle these using header- and body- checks, looking for
recognisable spam strings via regexes, and brought the volume down to
something more managable. Then I sat down, RTFM'd some more, (read lots of
posts on this list and Ralf's excellent postfix book), and set up my main-
and master- .cf files to something more sensible using postfixes reject- this
and reject- that filters (which reject most of the spam at connection time).
I ensured I wasn't an open-relay, and incorporated an RBL check as well as
ensuring amavis-new worked correctly. Additions to this was a minimum of
regex checks to suit my particular domain usage and to ensure I'm RFC
compliant. This was all a little complex to make sure I wasn't disabling one
thing while enabling another, but in the end I think I have it reasonably
under control. I now recieve approx. five spam messages each day, which
while in a perfect world this may be five too many, is really quite
acceptable when you consider from where I started.
This mail is just FYI and by way of saying:
"postfix and friends do a great job - many thanks!"
Ciao - shorter than aufwiedersehen
Richard Foley wrote:
> This mail is just FYI and by way of saying:
> "postfix and friends do a great job - many thanks!"
I second your sentiments and would like to shout out a big thank you to
Wietse for creating Postfix!
I was at about the same point you are now for more than 2 of the last 3
years, with about 5 spam a day making it into my inbox. Over the last 6
months or so that number has steadily increased, and in the last month
the curve has become much steeper, averaging 25-40 spam per day until
just this past week.
Over the weekend I implemented an access table and have started adding
the class C network of each host successfully getting spam into my
inbox. I'm down to less than 5 a day again. :)
Give it a shot. It doesn't take much time at all and the results are
well worth the effort.
I too would like to thank Wietse for Postfix along with the authors of
Maia Mailguard, amavis-new, clamav, spamhaus, et al..
Our Postfix frontend gateway processes almost 500,000 emails a day of
which we only accept less than 3% as being legitimate email for over
4,000 user accounts. Enterprise environment with the majority of users
are minimal Internet mail users.
We do this on one HP DL360G4 dual Xeon, 4GB RAM, (1 GB used as RAM disk
for amavis temporary work space) mirrored 36GB 15K SCSI320 drives
running SUSE Enterprise 10. We have been using this configuration for
almost two years now.
Considering we have been quoted well over $30,000 per year for a
"commercial" spam / anti-virus solution that would require a beefier
piece of hardware, Postfix has proved to our management that open source
software is in fact a very viable alternative to commercial software.