Date: Tue, 05 Apr 2005 11:31:59 -0500 From: Mark Johnston <mjohnston@skyweb.ca> To: Phillip Salzman <phill@sysctl.net> Cc: isp@freebsd.org Subject: Re: Antispam solutions Message-ID: <1112718719.7756.9.camel@localhost.localdomain> In-Reply-To: <000801c539f8$95268750$6745a8c0@MESE> References: <000801c539f8$95268750$6745a8c0@MESE>
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On Tue, 2005-04-05 at 11:00 -0500, Phillip Salzman wrote:
> One of the goals is to prevent the mail from actually hitting our backend
> Qmail systems, but at the same time give users the ability to weed through
> their messages in a quarantine. Initially we wanted to deploy Spam Assassin
> but haven't found any quarantine method available.
I set this up a while ago, but quarantining viruses instead of spam.
Here's what I did:
- Amavis, with the following config for quarantine:
@virus_quarantine_to_maps = (
new_RE( [qr'^([^+]+)(\+[^@]*)?@(.*)$' => '${1}+quarantine@$3'] )
);
This just appends "+quarantine" before the @ of virus-infected mail.
You could easily use @spam_quarantine_maps instead of @virus_... .
- Postfix, with virtual_mailbox_maps set to a complex SQL query that
figures out the appropriate maildir and sorts into folders based on
+extension
- @Mail, with IMAP access (dovecot), for users to come in and browse
through the quarantine. Power users can also browse the quarantine with
a regular IMAP client. Most customers use POP3 and don't get the
quarantined messages.
This is a pretty nifty setup, IMO - you get the full flexibility of
Amavis to run Spamassassin and virus scanners, and trivial access to the
quarantine via the web or via IMAP. I expect you could do the same
thing with qmail, but using -quarantine instead of +quarantine. If you
want to get a little fancier, you could throw together a simple
web-based IMAP client that had "spam/not spam" buttons for learning, and
a "rescue from quarantine" that moved the message back to the INBOX, so
it would show up in the POP3 box.
Hope that gives you some ideas,
Mark
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