Re: Spam filter

On Sat, 10 Nov 2007 14:14:18 -0500, Bolwerk <bolwerk@xxxxxxxxx> wrote:

Hi, I'm using FreeBSD 6.2 with postfix/postfix admin/courier imap+pop3.

But, but...above it says you are using gmail.com :)

Accounts are stored in a MySQL database, and I use maildirs stored in
/var/vmail/

We're in the process of migrating our mail accounts over from Windows
Server 2003 running IMail. As of now, we have a few hundred accounts,
but expect significantly more in the future.

What I'd like to do is set up a decent anti-spam solution now, while
we're small --- we already get a lot of it.

I'm open to other ideas,

I'm just curious...why not monkey see, monkey do...since you are using
Gmail, why not Gmail for everyone else in your organization? Did you
know that Gmail also offers a corporate version of their service that
allows you to use your own domain name and manage your user accounts?

but what I have in mind right now is to set up
something along the line of a spam filter that dumps junk mail in a
folder called "spam" or "junk" for the users to check

a) You might be underestimating the size of the problem.
See: http://www.acme.com/mail_filtering/
He is talking about receiving 1 million plus spams PER DAY at just one
e-mail address that saturates his T1 line and...you have how many
e-mail addresses?

b) You might want to consider farming the problem out to an e-mail
filtering service like: http://www.postini.com/
In addition to them being very good at what they do (personal
experience as a satisfied customer), when you crunch all the numbers,
you might also find them to be very cost effective when compared to
the costs involved in supporting an in-house anti-spam infrastructure
as an alternative.


if they want to.
I would prefer this to outright deleting spam, just in case something
legit comes through. I presume that it wouldn't be heard to clean out
such a folder; if the software doesn't already do it, I imagine a single
crond script could be written to traverse the directories and delete
messages older than 15 days during off-peak hours.

Given my configuration, what might be the easiest way to do this? I've
actually been a little overwhelmed by my options, and am admittedly a
little new to administering mail with postfix.

Thank you!

Some tools you might want to look at:

http://postgrey.schweikert.ch/
- greylisting

http://crm114.sourceforge.net/
- filtering

http://www.openspf.org/
- Sender Policy Framework (to deal with botnets)

.

Relevant Pages

  • Re: Spam filter
    ... We're in the process of migrating our mail accounts over from Windows Server 2003 running IMail. ... Gmail, why not Gmail for everyone else in your organization? ... something along the line of a spam filter that dumps junk mail in a folder called "spam" or "junk" for the users to check ...
    (comp.unix.bsd.freebsd.misc)
  • Re: [opensuse] Spam and this and other mailing lists
    ... pointless to blame this list for spam. ... I'm on a half dozen lists, some with my "Real" email address which ... gets filtered by Gmail. ... or Kmail's filtering options rather than complaining about the list. ...
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  • MR: Webmail spam filters.
    ... the quality of the various spam filters oon each of my mail accounts. ... Currently I have Wanadoo, SpamCop and Gmail. ... like the NTL account it attracts a couple of hundred ... Up until recently I thought it a good account, filtering about ...
    (uk.comp.sys.mac)
  • Re: Goodbye Gmail Users
    ... gmail address are being urged to quit using gmail addresses. ... assholes at Google who refuse to kill spam at the source. ... I don't use a "real" news reader and OE limits my filtering ability, ...
    (alt.home.repair)