l've setup Postfix amavis clamav spamassassin before and that seemed
to work pretty well. you might consider graylisting as well. l think
some have had good results with that.
On 7/18/07, Brad Guillory <[EMAIL PROTECTED]> wrote:
I am not sure what the policy is on cross posting so I have just replied to
euglug.
I have used postfix almost exclusively as my MTAs since about 1999 when I as
casting about for anything but sendmail. It takes a bit of configuration to
get it working with Amavis but after you have that working SPAM Assassin and
ClamAV are very easy add ons.
I haven't used exim so I can't compare it.
-How well do they do spam filtering in practice? I assume they operate in a
fashion similar to Sendmail milters. Does the quality of the available
filtering mechanisms compare to that of Sendmails?
The spam filtering is the real resource hog. I heavily use RBL to kill as
much spam as possible because of this. Postfix makes it easy to do this,
but I don't recall that there is anyway to cache the results from the RBL
lookup and pass that information on to spam assassin. So you either won't
use RBL information for spam assassin or you will be making multiple
lookups.
-How "heavy" are they? Sendmail can process huge volumes of mail on
surprisingly low-powered hardware, even while doing a fair amount of
mail-munging.
If you are doing spam and virus checking your MTA will not be the limiting
factor.
-What's the maintenance experience like, say 6 months or a year after
installation? I don't want something I have to constantly poke. I already
have an Exchange box for that....
After configuration it chugs away. As a matter of policy you should update
your RBL lists periodically and update the spam assassin and clamav as
needed. But you can automate the rule updates and virus definition updates.
On another note, if want all of this functionality and want some support
with it I would recommend checking out the Spam Firewall by Barracuda
Networks; in my opinion the UI is work the cost alone.
If you need configuration examples email me offlist.
Good luck, BMG
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Quentin Hartman
Sent: Wednesday, July 18, 2007 10:33 AM
To: Eugene Unix and Gnu/Linux User Group; Mid-Willamette Valley Linux Users
Group; General Linux/UNIX discussion and help, civil and on-topic;
[EMAIL PROTECTED]
Subject: [Eug-lug] MTA thoughts?
It's getting to be time to setup a mail gateway at the edge of my network to
sanitize stuff before it hits the company Exchange box. Originally I had
planned on setting it up using Sendmail, but I have had some recent exposure
to both Postfix and Exim, and they seem to be nice pieces of software and
are generally well respected online. The most attractive thing about them is
that they seem to "do the right thing" for the most, but maintain a fairly
good level of flexibility, without the configuration voodoo required by
Sendmail. As much as I like Sendmail's power, escaping from those arcane
texts is appealing. I did some looking about for comparisons among Sendmail,
Postfix, and Exim and the newest one I came upon was from 2003. I doubt very
much that conversation reflects the world as it is now. For any of you who
have used Postfix or Exim (or ideally both of those and Sendmail) in a
production or production-like environment I ask:
-How well do they do spam filtering in practice? I assume they operate in a
fashion similar to Sendmail milters. Does the quality of the available
filtering mechanisms compare to that of Sendmails?
-How "heavy" are they? Sendmail can process huge volumes of mail on
surprisingly low-powered hardware, even while doing a fair amount of
mail-munging.
-What's the maintenance experience like, say 6 months or a year after
installation? I don't want something I have to constantly poke. I already
have an Exchange box for that....
I'm also open to other suggestions, except Qmail. That looks more complex
than Sendmail, and I'm already familiar with Sendmail's weirdness. I know
that asking admins about MTAs is like asking coders about languages or
editors, so please keep the flaming to a minimum... :D
--
-Regards-
-Quentin Hartman-
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