dovecot - Oct 2014 - Invoking the spam checker on the sieve script

Hi.

TL/DR version:

Is it advisable to invoke an spam checker from the sieve script, and then, 
once the message is filtered, decide if should be moved to a certain spam 
folder?

A bit more context on why I'm considering this:

I'm just a geek who wants to handle his own mail, but not a great experience
as a system administrator. I don't have any corporate setup, just a simple
VPS
with me as the only user.

Previously I fetched all my mail through POP, and in the client of my PC I 
moved (lots of) mailing list traffic to its folders. Then, for those remaining 
messages (and only those remaining) I passed the spam filter and moved to spam 
folder. That's a significant saving since I have many mailing list 
subscriptions, and now I'm even using rss2email, so I have lots of email
that
is not spam.

I moved to IMAP and my filters are server side with sieve, but I don't have 
spam filtering yet. I thought I could replicate the setup easily, but it seems 
nobody is doing that, and everyone has the mail already scored when it reaches 
sieve. Seems like the "extprograms" extension would be a fit, but
again, nobody
seems to mention on documentation, so I'm fearing I'm probably wrong.

Suggestions?

Thank you very much!

-- 
Alex (a.k.a. suy) | GPG ID 0x0B8B0BC2
http://barnacity.net/ | http://disperso.net

Am 23.10.2014 um 17:11 schrieb Alejandro Exojo:
> Hi.
> 
> TL/DR version:
> 
> Is it advisable to invoke an spam checker from the sieve script, and then, 
> once the message is filtered, decide if should be moved to a certain spam 
> folder?
why not use i.e spamass milter with postfix to flag, and then use sieve
global rule to sort in Users Imap Junk Folder, to download SPAM Mails in
imap Junk folder via pop3 to , use dovecot virtual plugin

see

https://sys4.de/de/blog/2013/02/11/dovecot-virtual-setup-mit-globaler-sieve-spamfilter-regel-fur-pop3-nutzer/

sorry german only but configs should speak for its own
> 
> A bit more context on why I'm considering this:
> 
> I'm just a geek who wants to handle his own mail, but not a great
experience
> as a system administrator. I don't have any corporate setup, just a
simple VPS
> with me as the only user.
> 
> Previously I fetched all my mail through POP, and in the client of my PC I 
> moved (lots of) mailing list traffic to its folders. Then, for those
remaining
> messages (and only those remaining) I passed the spam filter and moved to
spam
> folder. That's a significant saving since I have many mailing list 
> subscriptions, and now I'm even using rss2email, so I have lots of
email that
> is not spam.
> 
> I moved to IMAP and my filters are server side with sieve, but I don't
have
> spam filtering yet. I thought I could replicate the setup easily, but it
seems
> nobody is doing that, and everyone has the mail already scored when it
reaches
> sieve. Seems like the "extprograms" extension would be a fit, but
again, nobody
> seems to mention on documentation, so I'm fearing I'm probably
wrong.
> 
> Suggestions?
i dont get what your problem is exactly
but looks like you wanna pre sort mail about other stuff  ( i.e. sender
) and doing spam sort at last, should be no problem with a sieve user
rule if spam score is allready in the mail ( flagged by spamassassin
before) etc
> 
> Thank you very much!
> 
i wouldnt use extprograms for spam scanning, i see no need for it


Best Regards
MfG Robert Schetterer

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Am 2014-10-23 um 17:11 schrieb Alejandro Exojo:
>
> I moved to IMAP and my filters are server side with sieve, but I don't
have
> spam filtering yet.
I understand, that you do not want spamassassin (SA) to check lots of 
messages that are clean anyways.

If you can call SA from sieve, as a condtion in an if clause, filtering 
should be no problem, should it?

MUAs, e.g. Thunderbird (TB) also have good junk filters, so that might 
be an option too. In one account of mine, mail is filtered on the server 
and I later have TB filter the SPAM folder locally and occasionally they 
both disagree ;) False SA positives are more rare than false SA 
negatives. SA and TB score about the same, though TB seems to me to be 
more accustomed to my spool.

On a server I administer, quite similar to your setup, very few users, I 
recently had to turn on greylisting, which proved exceptionally well in 
reducing SA load: Checking is done there during SMTP time. Of course 
this will not help in your case when the bulk will pass...
> I thought I could replicate the setup easily, but it seems
> nobody is doing that, and everyone has the mail already scored when it
reaches
> sieve. Seems like the "extprograms" extension would be a fit, but
again, nobody
> seems to mention on documentation, so I'm fearing I'm probably
wrong.
You can use this list to provide the missing documentation ;)

-- 
peter