mail server setup
kprescott at coolip.net
Wed Jan 13 16:20:17 EST 2016
I agree, that’s essentially what I do with Zimbra, and I almost never get a spam message.
I do, however, sometimes get good emails tagged as spam. I just put them in my non-spam folder, and my system learns.
From: Speakup [mailto:speakup-bounces at linux-speakup.org] On Behalf Of John G Heim
Sent: Wednesday, January 13, 2016 8:00 AM
To: Speakup is a screen review system for Linux. <speakup at linux-speakup.org>
Subject: Re: mail server setup
I don't think there is a better spam filtering tool than spamassassin. I ran the mail server for my department and all by myself, I was able to get filtering as efficient as the campus mail server which used a commercial product and had a full-time employee tuning it. The secret is crowd sourcing. I had it download a new set of rules nightly and configured it to use 3 crowd sourced systems, dcc, razor and pyzor. It took a while to set all that up but once it was done, all I had to do was sit back and let the world tune my spam filter.
Spamassassin is a bigger resource hog than anything else in a mail system. I think that is probably true of any spam/virus filter. There is just a lot to do. And really, it's the virus scanning part that is the worst. You don't want to skip that. We had about 200 users on a machine with 16 cores and 32 Gb of ram. It never had a problem with the load.
On 01/11/2016 01:43 PM, Janina Sajka wrote:
> I've got my crm set up via my personal ~/.procmailrc . It can also be
> setup system wide, however I haven't needed that recently.
> The crm home page does discuss site wide deployment:
> I note one can even use it with Spamassassin. I didn't go that way. I
> dropped Spamassassin because it was spawning far too many processes
> that were absorbing far too much of my available system resources, so
> that other tasks on my server were suffering.
> Am I completely happy with the results? No. I still get too many false
> positives and consequently still need to look at my spam folder from
> time to time. I've white-listed many more email sources than I would
> have expected.
> However, I see no more than a dozen or so emails in my inbox daily,
> and that's a big improvement over what I was getting from Spamassassin.
> covici at ccs.covici.com writes:
>> How would you use crm114 for spam filtering? Also, I am unfamiliar
>> with dkim and dmark, -- I do have sendmail -- how would those help?
>> Janina Sajka <janina at rednote.net> wrote:
>>> Juan Hernandez writes:
>>>> I need webmail, imap, virtual domains, spam/antivirus protection, etc.
>>> Let's take them one at a time ...
>>> This one is easy. Go with squirrelmail .
>>> Another easy one, dovecot .
>>> virtual domains
>>> Any mta worth its salt will give you this. It's pretty trivial, e.g. in
>>> sendmail you simply add domains into a config file, one per line. If
>>> need be, you can get more elaborate, e.g. direct mail addressed to
>>> a at b.c. to d at e.f. It's all very doable.
>>> spam/antivirus protection
>>> This one is more complicated, and more important. I'm sure you're not
>>> interested in becoming an open relay for every spammer on the planet?
>>> Antivirus -- You probably only care if you have users on Windows.
>>> clamav is my choice for this, though mine is curently broken--I don't
>>> have windows clients.
>>> anti-spam -- much of this depends on a good mta configuration. Today's
>>> mta's, you'll probably select either sendmail or procmail, set you up
>>> by default with a pretty good configuration. You'll want to carefully
>>> read your way through the config file to understand what's going on.
>>> This is the starting point.
>>> Next is the process of sorting the mail that arrives into "probably OK"
>>> and "probably junk" piles. People used to rely on spamassassin for
>>> that, but I found it far too resource heavy and stopped using it about
>>> two years ago. I'm now using crm114. And, with Jason White, I'm looking
>>> at possibly moving to rstampd .
>>> In any case, you'll want to configure dkim and dmark for your mta.
>>> These assist the net in assuring you and everyone else that what you
>>> receive, and what you send is legit.
>>> Spam is a never ending battle. Expect to need to work on your
>>> configurations and approaches from time to time as the months and years
>>> go by.
>>> If this sounds daunting, that's probably good. It's not a trivial task,
>>> but it can be fun and certainly can be rewarding. I certainly have no
>>> interest in giving up my setup for some service somewhere else.
>>> Janina Sajka, Phone: +1.443.300.2200
>>> sip:janina at asterisk.rednote.net
>>> Email: janina at rednote.net
>>> Linux Foundation Fellow
>>> Executive Chair, Accessibility Workgroup: http://a11y.org
>>> The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
>>> Chair, Accessible Platform Architectures http://www.w3.org/wai/apa
>>> Speakup mailing list
>>> Speakup at linux-speakup.org
>> Your life is like a penny. You're going to lose it. The question is:
>> How do
>> you spend it?
>> John Covici
>> covici at ccs.covici.com
>> Speakup mailing list
>> Speakup at linux-speakup.org
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