sendmail question

[Robert Meyer]

Yep, you're making a big assumption.  That kind of thing doesn't happen in any
of the Unix enterprise environments that I've been in.  The mail comes in to
the SMTP server directly and the SMTP server does everything (including
scanning for MS viruses if you get one of the filtering packages).  I generally
think of a firewall as more or less a router with packet filtering (yes, I know
it's a bit more complicated than that) and doing more processing than that
generally slows the whole mess down.

Generally, the filter either sits in front of the SMTP daemon or (most likely)
is attached at the hip with the SMTP server and becomes part of the incoming
mail processing.  For instance, several of the MS virus filtering programs for
Linux/Unix (it's fun trying to explain this concept to an MS person) are
invoked from one of the sendmail rules as part of the normal processing.  You
can do recipient/spam filtering in 'procmail' by simply making a change to one
of the sendmail rules and invoking a procmail filtering program as part of the
normal incoming message processing.  I'm not as familiar with 'qmail' but I
imagine that it's pretty much the same there.

later...

Bob

--- JJ Neff <jjneff at yahoo.com> wrote:
> This is waht I was thinking in my ramblings earlier.  On eproduct I know of
> (firewall again) is InterScan thatscans all mail and can pull and forward to
> another user on a mail by mail basis.  It can delete or forward or whatever
> all
> mail from user1 to user2 .  Again I am making the aassumptionthat all amil is
> hitting some firewall software/hardware before it enters your "real" smtp
> server...
> 
> JJN
> --- Darin Perusich <Darin.Perusich at cognigencorp.com> wrote:
> > setting up an email alias is not going to work in this case. here's my
> > example, i have 3+ users darin at nflug.org, slick at nflug.org, and
> > wiseguy at adelphia.com. 
> > 
> > wiseguy at adelphia.com is sending email to slick at nflug.org, i want to
> > intercept all email From: wiseguy at adelphia.com and push it over to
> > darin at nflug.org.
> > 
> > aliases and virtuserstable will not work because they look at who the
> > message it being delivered To: and map that name to the actual user,
> > address, or alias.
> > 
> > Joe Bielli wrote:
> > > 
> > > Do what Dege says :) for basic forwarding all you need is aliases.
> > > Here is another trick I've learned with sendmail.. if you want to use
> > > virtusertable to map a non-existant name on a specific domain to a
> > > distribution list or more than one recipient:
> > > 
> > > Create an entry in virtusertable:
> > > 
> > > dist at somedomain.com  distlist
> > > 
> > > Then, in /etc/aliases create the following:
> > > 
> > > distlist:      me at mydomain.com, user2, user3 at otherdomain.com
> > > 
> > > ...... The reason for this? Virtusertable will not allow more than one
> > > recipient; you need to feed it an alias from the aliases file which will
> > > handle it from there.
> > > 
> > > (ps. don't forget to do the makemap and newaliases)
> > > 
> > > Joe Bielli
> > > Computer SOS, inc.
> > > 1505 Cleveland Drive
> > > Buffalo, NY 14225
> > > P:// 716.635.0086
> > > E:// jbielli at netsos.com
> > > 
> > > 
> > > -----Original Message-----
> > > From: owner-nflug at nflug.org [mailto:owner-nflug at nflug.org] On Behalf Of
> > > Darin Perusich
> > > Sent: Monday, October 22, 2001 10:07 AM
> > > To: nflug at nflug.org
> > > Subject: sendmail question
> > > 
> > > hello,
> > > 
> > > i have a sendmail question that i'm trying to solve and i keep getting
> > > half way there but it never pans out. i want to send all incoming email
> > > from user at domain.com and forward to mymailbox at mydomain.com. here's a few
> > > things that i've look at.
> > > 
> > > 1. access database - access allows you to take
> > >         From:user at domain.com    RELAY/REJECT/OK
> > > 
> > > 2. virtuserstable - maps nonexistant address or domains to real
> > > addresses. doesn't appear to allow headed specific info, at least that
> > > i've found yet.
> > > 
> > > these looked the most promising. has anyone ever done something list
> > > this?
> > > 
> > > --
> > > Darin Perusich
> > > Unix Systems Administrator
> > > Cognigen Corp.
> > > darinper at cognigencorp.com
> > 
> > -- 
> > Darin Perusich
> > Unix Systems Administrator
> > Cognigen Corp.
> > darinper at cognigencorp.com
> 
> 
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=====
Bob Meyer
Knightwing Communications, Inc.
36 Cayuga Blvd
Depew, NY 14043
Phone: 716-308-8931 or 716-681-0076
Meyer_RM at Yahoo.com

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