Outgoing mail filters

Outgoing mail filters

[Scott Taylor]

Hello all,

I use sendmail and procmail to filter incoming messages for spam and 
windoze executable attachments.  How can I filter outgoing mail?

Cheers.

Scott.

Re: Outgoing mail filters

[urgrue]

i use mailscanner (www.mailscanner.info i think). very easy to set up. 
it supports most major virusscanners as well as a few anti-spam 
solutions (spamassassin is what i use, works well too).



> Hello all,
> 
> I use sendmail and procmail to filter incoming messages for spam and 
> windoze executable attachments.  How can I filter outgoing mail?
> 
> Cheers.
> 
> Scott.
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-
> admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: Outgoing mail filters

[Scott Taylor]

At 07:45 AM 02/04/2004, urgrue wrote:
>i use mailscanner (www.mailscanner.info i think). very easy to set up. it 
>supports most major virusscanners as well as a few anti-spam solutions 
>(spamassassin is what i use, works well too).

Hi Urgrue,

You use this for filtering outgoing mail?  Maybe I'm just going blind 
looking at this screen too much, but I can't find anything on their site 
about filtering outgoing mail.

Cheers.

Scott.



>>Hello all,
>>I use sendmail and procmail to filter incoming messages for spam and 
>>windoze executable attachments.  How can I filter outgoing mail?
>>Cheers.
>>Scott.
>>-
>>To unsubscribe from this list: send the line "unsubscribe linux-
>>admin" in
>>the body of a message to majordomo@vger.kernel.org
>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>-
>To unsubscribe from this list: send the line "unsubscribe linux-admin" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Outgoing mail filters

[urgrue]

hi,
yes it works for outgoing also. this because im not running mailscanner 
in procmail (which is how most people set up their mail scanners), but 
like this:
/usr/sbin/sendmail -bd -ODeliveryMode=queueonly -OQueueDirectory=/var/
spool/mqueue.in
/usr/sbin/sendmail -q15m -om
/opt/mailscanner/bin/check_mailscanner

so you see, one instance of sendmail spools my mail to mailscanner's 
dir (mqueue.in), mailscanner goes through that dir continuously, scans 
the contents, and moves scanned files to sendmails real queue dir, and 
the second instance of sendmail sends from there.
thus, since i use the same server for sending and receiving mail, 
incoming and outgoing mail are all the same

the beauty of it is, these startup commands are the totality of the 
configuration required to get it working with sendmail. you dont have 
to lay a finger on procmailrc, sendmail.cf, or anything else.




> At 07:45 AM 02/04/2004, urgrue wrote:
>> i use mailscanner (www.mailscanner.info i think). very easy to set 
>> up. it supports most major virusscanners as well as a few anti-spam 
>> solutions (spamassassin is what i use, works well too).
> 
> Hi Urgrue,
> 
> You use this for filtering outgoing mail?  Maybe I'm just going blind 
> looking at this screen too much, but I can't find anything on their 
> site about filtering outgoing mail.
> 
> Cheers.
> 
> Scott.
> 
> 
> 
>>> Hello all,
>>> I use sendmail and procmail to filter incoming messages for spam 
>>> and windoze executable attachments.  How can I filter outgoing mail?
>>> Cheers.
>>> Scott.
>>> -
>>> To unsubscribe from this list: send the line "unsubscribe linux-
>>> admin" in
>>> the body of a message to majordomo@vger.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-
>> admin" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-
> admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: Outgoing mail filters

[Scott Taylor]

Kewl.  Thanks.

Scott.

At 12:39 AM 02/05/2004, urgrue wrote:
>hi,
>yes it works for outgoing also. this because im not running mailscanner in 
>procmail (which is how most people set up their mail scanners), but like this:
>/usr/sbin/sendmail -bd -ODeliveryMode=queueonly -OQueueDirectory=/var/
>spool/mqueue.in
>/usr/sbin/sendmail -q15m -om
>/opt/mailscanner/bin/check_mailscanner
>
>so you see, one instance of sendmail spools my mail to mailscanner's dir 
>(mqueue.in), mailscanner goes through that dir continuously, scans the 
>contents, and moves scanned files to sendmails real queue dir, and the 
>second instance of sendmail sends from there.
>thus, since i use the same server for sending and receiving mail, incoming 
>and outgoing mail are all the same
>
>the beauty of it is, these startup commands are the totality of the 
>configuration required to get it working with sendmail. you dont have to 
>lay a finger on procmailrc, sendmail.cf, or anything else.
>
>
>
>
>>At 07:45 AM 02/04/2004, urgrue wrote:
>>>i use mailscanner (www.mailscanner.info i think). very easy to set up. 
>>>it supports most major virusscanners as well as a few anti-spam 
>>>solutions (spamassassin is what i use, works well too).
>>Hi Urgrue,
>>You use this for filtering outgoing mail?  Maybe I'm just going blind 
>>looking at this screen too much, but I can't find anything on their site 
>>about filtering outgoing mail.
>>Cheers.
>>Scott.
>>
>>
>>>>Hello all,
>>>>I use sendmail and procmail to filter incoming messages for spam and 
>>>>windoze executable attachments.  How can I filter outgoing mail?
>>>>Cheers.
>>>>Scott.
>>>>-
>>>>To unsubscribe from this list: send the line "unsubscribe linux-
>>>>admin" in
>>>>the body of a message to majordomo@vger.kernel.org
>>>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>-
>>>To unsubscribe from this list: send the line "unsubscribe linux-
>>>admin" in
>>>the body of a message to majordomo@vger.kernel.org
>>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>-
>>To unsubscribe from this list: send the line "unsubscribe linux-
>>admin" in
>>the body of a message to majordomo@vger.kernel.org
>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>-
>To unsubscribe from this list: send the line "unsubscribe linux-admin" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

Slightly OT: Taking Unix/Linux class?

[Eve Atley]

I'd like to get opinions on possibly taking a linux/unix course. We run a
Red Hat 9 linux server in a small business, and I come from a primarily
windows environment (though I do use a little Unix on Mac OS X). I was
debating taking a unix/linux course at a local community college. We also
own "Red Hat Linux Networking and System Administration", but obviously I
need the time to read this book. I don't have the luxury of playing with our
server to learn and get hands-on feel.

So based on this course description...is it worth it? How in-depth do
community college courses of this nature go? Is there another, perhaps
better way to go about learning what I need to know?


CIT-220 Unix Operating System
------------------------------
Section AW60 R
 06:15PM-09:20PM
 (3 credits)
Dates: 01/26/04 - 05/01/04
Prerequisite(s): PREREQUISITES: CIT111, CIT115
This course introduces students to the UNIX and LINUX operating systems.
Lecture and classroom labs using a UNIX/LINUX operating system
environment cover the following topics: internal design concepts, command
line
interface, text editing, shell scripting, and file maintenance tools.
Additional topics include tools and facilities used in administering a
small network including user account management, file system permissions,
printer management, system monitoring, backup/restore of files, and other
administrative tools.


Thanks,
Eve

Re: Slightly OT: Taking Unix/Linux class?

[Joakim Ryden]

On Thu, Feb 05, 2004 at 01:12:13PM -0800, Eve Atley wrote:
=> 
=> I'd like to get opinions on possibly taking a linux/unix course. We run a
=> Red Hat 9 linux server in a small business, and I come from a primarily
=> windows environment (though I do use a little Unix on Mac OS X). I was
=> debating taking a unix/linux course at a local community college. We also
=> own "Red Hat Linux Networking and System Administration", but obviously I
=> need the time to read this book. I don't have the luxury of playing with our
=> server to learn and get hands-on feel.

No course in the world, in my experience, is gonna replace playing around.
Playing Around[TM] is a highly and severly underestimated way of learning
(this stuff). Some classes/theory under the belt isn't gonna hurt though.

=> So based on this course description...is it worth it? How in-depth do
=> community college courses of this nature go? Is there another, perhaps
=> better way to go about learning what I need to know?
 
What is it you do need to know? Are you going to be adminestering this
system? Or do you just want to get some general knowledge?

--Jo

Re: Slightly OT: Taking Unix/Linux class?

[Glynn Clements]

Eve Atley wrote:

> I'd like to get opinions on possibly taking a linux/unix course. We run a
> Red Hat 9 linux server in a small business, and I come from a primarily
> windows environment (though I do use a little Unix on Mac OS X). I was
> debating taking a unix/linux course at a local community college. We also
> own "Red Hat Linux Networking and System Administration", but obviously I
> need the time to read this book. I don't have the luxury of playing with our
> server to learn and get hands-on feel.
> 
> So based on this course description...is it worth it? How in-depth do
> community college courses of this nature go? Is there another, perhaps
> better way to go about learning what I need to know?

I don't believe that you can become even remotely competent in any
aspect of computing (whether programming, administration, or even just
usage) based solely or primarily upon academic tuition; there is just
too much to learn.

If you don't know where to start, a course may help to provide useful
orientation. But the bulk of the knowledge inevitably has to be
acquired by other means; primarily through a mixture of reading and
practice.

If the only Linux box available is the server, and you can't practice
on that, other alternatives include:

1. Using a bootable Linux distribution (e.g. Knoppix) to practice on
what is normally a Windows box, without needing to interfere with the
Windows setup.

2. Getting another box; apart from some of the desktop components,
most current Linux distributions will work fine on the computers which
are normally considered obselete (e.g. P90s, maybe even 486s; the kind
of systems which tend to be thrown away because their second-hand
value is so close to zero).

3. Using other Unix-like systems, e.g. MacOSX, or a Windows box with
Cygwin installed. Cygwin has a few "quirks", due to having to run on
top of a decidedly non-Unix OS, but most of the utilities are exactly
the same programs which form the core of any Linux distribution.

-- 
Glynn Clements <glynn.clements@virgin.net>

Re: Slightly OT: Taking Unix/Linux class?

[Jay Goodman]

Well, I'd like to chime in without the rantings of the 'haughty linux
wizards'.    Eve, the course sounds likes it will point you in the right
direction. And some people need courses as a basis to get them started in
the the learning process. The course description of topics to be covered 
seems to be a good foundation and progression,  but as suggested earlier
make sure you play around alot.  Somehow get a spare machine (even an old
clunker) and put RedHat on it. If you have access to a bunch of spare
machine, use them all.  I wouldn't recommend dual booting a machine since
I garuntee you'll be blowing up you OS on the quest for knowledge several 
times along the way.

Someone earlier suggested Knoppix and I'd recommend against that
suggestion.  Knoppix is Debian based and there is just enough of a
difference at the administration level between Debian and Redhat for the
beginner(as you claim to be) to get very frustrated.  If you cannot get
any spare machines at all,
then your last resort is knoppix.

Learn the basics with the system you'll be using most (Redhat) and then
when the neccessary, sprout out.  Play and read alot.   If you get stuck,
Google can almost always help, even with the toughest of questions. 
Messages boards can be useful, but be aware that there are a lot of
arrogant linux users out there.  Just ignore them and listen to the good
guys.

Good luck and have fun.



>
> I'd like to get opinions on possibly taking a linux/unix course. We run
> a Red Hat 9 linux server in a small business, and I come from a
> primarily windows environment (though I do use a little Unix on Mac OS
> X). I was debating taking a unix/linux course at a local community
> college. We also own "Red Hat Linux Networking and System
> Administration", but obviously I need the time to read this book. I
> don't have the luxury of playing with our server to learn and get
> hands-on feel.
>
> So based on this course description...is it worth it? How in-depth do
> community college courses of this nature go? Is there another, perhaps
> better way to go about learning what I need to know?
>
>
> CIT-220 Unix Operating System
> ------------------------------
> Section AW60 R
>  06:15PM-09:20PM
>  (3 credits)
> Dates: 01/26/04 - 05/01/04
> Prerequisite(s): PREREQUISITES: CIT111, CIT115
> This course introduces students to the UNIX and LINUX operating systems.
> Lecture and classroom labs using a UNIX/LINUX operating system
> environment cover the following topics: internal design concepts,
> command line
> interface, text editing, shell scripting, and file maintenance tools.
> Additional topics include tools and facilities used in administering a
> small network including user account management, file system
> permissions, printer management, system monitoring, backup/restore of
> files, and other administrative tools.
>
>
> Thanks,
> Eve
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-admin"
> in the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Slightly OT: Taking Unix/Linux class?

[terry white]

on "2-5-2004" "Jay Goodman" writ:

: rantings of the 'haughty linux wizards'

    perhaps then, asking in a M$ based environment a better plan.


: system you'll be using most (Redhat)

    that is an assumption, UNLESS of course, the 'enterprise' is in your
immediate future.  a little 'reading' on RH's distribution plans might be
a good idea.


: arrogant linux users out there.  Just ignore them and listen to the good
: guys.

    it is a "REAL TIME" error, to confuse 'arrogance' with 'expertise'.
further, being hung up on the former, almost guarantees an inability to
aquire the latter ...


-- 
... i'm a man, but i can change,
    if i have to , i guess ...

Re: Slightly OT: Taking Unix/Linux class?

[terry white]

... ciao:

on "2-5-2004" "Eve Atley" writ:

: Red Hat 9 linux server in a small business ... We also own "Red Hat
: Linux Networking and System Administration" ... I don't have the luxury
: of playing with our server

    it is unclear to me, 'why' you want to 'learn' linux.  if it's work
related, you have a problem.  RH, in an M$-esque move, no longer offers
distributions like they did in the past.  RH has gotten expensive.
also, RH almost always 'back-ported' security patches, and in so doing,
kept the 'user' tied to them.
    in addition, if your work environ does not allow adequate time to get
the job done, then you're walking into a situation where you have
ultimate responsibility, and "NO" authority.  trying to 'learn' on a
"production" machine is not a prudent choice in any event, and is not a
good career move.

    it's my opinion, linux not taught, but learned.  if you're serious,
you'll put a system together, and suffer the learning curve involved.
initially, you can expect to break something, and then you get to fix it.

    fwiw:

    (a)  RTFM  (read the fucking manual)
    (b)  'man man'
    (c)  'apropos foobar' a very helpful information template ...


-- 
... i'm a man, but i can change,
    if i have to , i guess ...

Re: Slightly OT: Taking Unix/Linux class?

[Stephen Samuel]

Having taught courses, I'd say that you could find them useful, especially
if you have a good instructor. The course should give you some directed
hands-on experience with a live system, teach you some stuff you hadn't
considered and hopefully even disabuse you of some bad practices.

On the other hand, do NOT presume that the course will turn you into
an overnight guru.  Time energy and, as someone else pointed out, "Just
Playing Around" are what you need for something like that.

Some suggestions:
  1: get yourself a machine (home or work) that you can play with.  It
doesn't have to be an expensive new box.   An old P3/500 with a 10Meg
hard drive is a fine start.  If you want to play with networking get
a couple more .. A couple of P2s with 64 meg of ram will do OK.  With
that and a KVM switch, you're ready to play.

If you get the hardware second hand (or out of an old store room), it'll
probably be a good bit less expensive than the course, and will give you
a leg up during the course and after (before, even).

man man is your friend

Eve Atley wrote:
> I'd like to get opinions on possibly taking a linux/unix course. We run a
> Red Hat 9 linux server in a small business, and I come from a primarily
> windows environment (though I do use a little Unix on Mac OS X). I was
> debating taking a unix/linux course at a local community college. We also
> own "Red Hat Linux Networking and System Administration", but obviously I
> need the time to read this book. I don't have the luxury of playing with our
> server to learn and get hands-on feel.
> 
> So based on this course description...is it worth it? How in-depth do
> community college courses of this nature go? Is there another, perhaps
> better way to go about learning what I need to know?
> 
> 
> CIT-220 Unix Operating System
> ------------------------------
> Section AW60 R
>  06:15PM-09:20PM
>  (3 credits)
> Dates: 01/26/04 - 05/01/04
> Prerequisite(s): PREREQUISITES: CIT111, CIT115
> This course introduces students to the UNIX and LINUX operating systems.
> Lecture and classroom labs using a UNIX/LINUX operating system
> environment cover the following topics: internal design concepts, command
> line
> interface, text editing, shell scripting, and file maintenance tools.
> Additional topics include tools and facilities used in administering a
> small network including user account management, file system permissions,
> printer management, system monitoring, backup/restore of files, and other
> administrative tools.
> 
> 
> Thanks,
> Eve

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
    Powerful committed communication. Transformation touching
      the jewel within each person and bringing it to light.

Re: Outgoing mail filters

[Glynn Clements]

Scott Taylor wrote:

> I use sendmail and procmail to filter incoming messages for spam and 
> windoze executable attachments.  How can I filter outgoing mail?

One possible approach:

The easy part: change confSMTP_MAILER to a custom mailer (e.g. 
procmail invoked on a specialised procmailrc file) which performs the
filtering then re-sends the message. See section 5.4 of the Sendmail
Installation and Operation Guide (op.ps/op.txt) for details on writing
the mailer definition.

The hard (or, at least, awkward) part: preventing loops; you have to
ensure that the re-sent message doesn't get sent back to the filter. 
Probably the simplest solution is to run two sendmail daemons (on
separate ports), one which filters and one which doesn't. You can do
it with one daemon, but that involves writing custom sendmail
rulesets.

Other approaches include using sendmail's "milter" API (you probably
wouldn't want to use this directly, but there may be suitable products
which use it to "plug in" to sendmail) or the header-matching features
which were added in 8.10.

-- 
Glynn Clements <glynn.clements@virgin.net>

RE: Slightly OT: Taking Unix/Linux class?

[Aleksander Kujbida]

I recently spent nearly 4000 dirhams on a course that following a highly 
structured and very attractive syllabus. It looked very impressive, but I 
spent more time teaching them than the other way. Didn't bother finishing 
the course, money non-refundable. All gone, plus my time down the toilet. I 
still think courses can be valuable (considering that I have taught many 
much), but you must get references from knowledgable people who have taken 
the course before.

And get a box to play with ;-)

Sincerely,
Aleksander


>From: "Eve Atley" <eatley@wow-corp.com>
>To: <linux-admin@vger.kernel.org>
>Subject: Slightly OT: Taking Unix/Linux class?
>Date: Thu, 5 Feb 2004 13:12:13 -0800
>
>
>I'd like to get opinions on possibly taking a linux/unix course. We run a
>Red Hat 9 linux server in a small business, and I come from a primarily

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