Ideas on Fairly simple Spam reject at SMTP gateway?

[Neal Rhodes]

On Wed, Apr 27, 2005 at 02:22:30PM -0700, Rick Stevens wrote:
> Alexander Dalloz wrote:
> > Am Mi, den 27.04.2005 schrieb Neal Rhodes um 22:25:
> > 
> > Please don't reply to a previous list mail when starting a new topic.
> > Now your new mail is a reply to "Re: All coreutils binaries segfault,
> > requiring complete reinstall of linux".

oops.  Thanks for the reminder. 

> >>Assuming one doesn't have the time to make a major career out of it, are
> >>there recommendations for putting up an SMTP gateway that does the basic
> >>spam detection and rejection?    I heard "procmail" was generally favored
> >>by some, but after installing, it doesn't seem to have anything configured. 
> >>
> >>I guess I'm hoping for a recipe, or at least an ingredients list. 
> > 
> > 
> >>Neal Rhodes                    MNOP Ltd                       (770) 972-5430
> > 
> > 
> > Procmail is no spam detection tool. SpamAssassin (shipped with Core) is
> > one which is for spam rating of mail. It can be integrated to the mail
> > server system by using Procmail. Procmail can not reject mail but only
> > can lead to bounces which is bad as you would hit to many faked and
> > innocent senders.

Sorry for the confusion.  What I am looking for is an SMTP gateway with 
features to avoid getting some of the spam in the first place, such as 
time delay within the SMTP protocol, reverse DNS lookups, header analysis, 
refusal to relay, and other tricks which discourage spam delivery.   As I 
understood it, Spamassassin works after the mail is received, and marks 
suspect email for deletion, and takes a fair amount of tinkering and updating
to stay functional. 



> More correctly, procmail is an MDA or "mail delivery agent".  It is
> responsible for the final delivery of mail into a mailbox or somewhere
> else via a forward or intermediary program.
> 
> For the archives:
> 
> MTA - Mail Transport Agent.  Responsible for sending mail between 
> systems using the SMTP ("simple mail transport protocol") protocol or
> a derivative such as SMTP-S.  Programs such as sendmail, postfix, 
> Exchange and qmail are MTAs (Exchange is an oddball--it acts as MTA,
> MDA and MUA).
> 
> MDA - Mail Delivery Agent.  Responsible for delivering mail to mailboxes
> for pickup by MUAs (see below) or for forwarding or bouncing mail using
> an intermediate agency (such as invoking sendmail to send mail off-
> system).  Programs such as procmail are MDAs.
> 
> MUA - Mail User Agent.  Responsible for delivering mail to a user.
> The most common MUA protocols are imap4 and pop3.  Programs such as
> imapd, pop3d and dovecot are MUAs.
> 
> MCP - Mail Client Program.  Responsible for displaying mail to the user
> after picking it up from a MUA.  Programs such as Thunderbird, Outlook,
> Eudora, Mozilla Mail, Evolution, *nix mail, pine, and elm are MCPs.
> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
> - VitalStream, Inc.                       http://www.vitalstream.com -
> -                                                                    -
> -           "I understand Windows 2000 has a Y2K problem."           -
> ----------------------------------------------------------------------
> 
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============================================================================
Neal Rhodes                    MNOP Ltd                       (770) 972-5430
President                  4737 Habersham Ridge         fax:  (770) 978-4741
                          Lilburn (atlanta) GA 30047