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Hello Håkon,

Wednesday, September 17, 2003, 2:39:35 AM, you wrote:

H> I'm using spamassassin, and got access to an account that as A LOT of
H> spam which I'm testing SA on. The results are very good, as to SA
H> identifying spam mail.

I rely on several myself -- they often serve as an early warning system
... a false negative through them allows me to sa-learn or do whatever is
needed to catch the spam before it hits a real user's address.

H> I'm wondering about the following:
H>  - When SA tags a mail (as most configs I've seen out there does) -
H> does it delete the mail after 'learning' about the spammers?

SA never deletes email on its own. Systems that employ SA may do so, but
they need to do so outside of SA, by reading SA's output headers or
result code.

H>  - Will the user receive just as many mail, but 95% of the mails he
H> receive are spam mail - hence just tagged, and not removed?

With a default installation, the user will receive all of the email,
including all of the spam, but with the spam flagged. There are several
methods of flagging:
* option: change the subject header to indicate ** SPAM **
* option: Encapsulate the original email and make a spam warning the main
  body of the email.
* always (I think): add headers to the email which identify whether SA
  things the email is spam or not, and how likely it is to be spam or
  not-spam.

H>  - Is it recommended that I set up SA to drop any mail that classifies
H> as a tagged mail? Instead of tagging, I could simply nuke the mails.

No. I strongly recommend (as do many others) that email NOT be
automatically dropped or deleted. Though they are rare, the occasional
not-spam email gets flagged as spam. The only way to a) know this has
occurred, b) prevent future occurrences, and c) recover the mis-flagged
email, is to keep that email available somewhere, somehow.

First false positive I ever received was official email from my domain
host, giving me information concerning how to manage the domain on their
server. I'd have had severe problems if that email had been lost.

Lose an automatic spam-looking mailing from a mortgage company notifying
their actual customer of a due payment or other important information,
and you may end up causing serious problems for that customer.

H> It's pretty usefull to tag the mail, but it's very useless if it
H> persists. The user needs to get rid of the mail. I hope you guys can
H> help me out here.

I use two methods:

1) Some users get all email regardless of spam flag. These include my
father (paranoid about missing something important) and myself (able to
tweak the system any which way I want). Email clients then filter the
spam into folders where real email can be readily dealt with, and spam
can be reviewed at our leisure to make sure it really is spam.

2) Some users get only email not flagged as spam. Their spam-flagged
email gets redirected into a spam-trap which I collect along with my own
email. I review the spam for them. If I see any obvious false positive, I
modify the SA setup as needed to identify the email as not-spam, and
redirect it to the user. If I see anything which looks like it might be a
false positive but could also be spam, I let them know what I received
and let them determine whether it's spam or not.

Bob Menschel

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