On 26/10/10 12:10, B. Alexander wrote:
Hi all,
I figured I would ask for a sanity check here. I'm looking to replace my
internal mail server. Right now, I'm running Zimbra 5.0.x, but I have always
run on the low end of the hardware requirements, and now, the box I am
running on (2.4 GHz P4, 1GB RAM) is being beaten to death by java in zimbra.
Load average always hovers between 3 and 6.
Now the mail server, since Comcast blocked port 25, is mainly used for
internal monitor/security messages, like ossec and opsview, apticron
messages, etc. So I was looking to set up an OpenVZ container, probably sid,
as a mailserver with the following:
* postfix
* dovecot
* spamassassin (in case I ever decide to work around the port 25 block)
* roundcube for webmail
Anyone got any suggestons? Either anything I'm missing or packages that work
better?
I've never had trouble with the Debian default of exim4, so I've never
looked around for a replacement. I picked Courier IMAP several years
ago, and again have never seen a reason to move. I use webmail only
occasionally, so the aesthetics of SquirrelMail are not a problem.
I have tried spamassassin, but as others have said, it's a bit of a hog.
Or it was when I last ran it, several years ago now. These days I use no
subject or content checking at all, just a few SMTP-level tests in
addition to exim4's standard DNS and sender checks. It checks just under
3000 blacklisted CIDR blocks, refuses about 20 country codes in HELO and
PTR strings, attempts to recognise dynamic IP addresses from the same
strings and refuses two or three particularly egregious foreign ISPs. I
assume postfix will do the same kind of thing.
The email address at the top of this post is genuine, and has existed
for over twelve years on the same fixed IP address. I therefore get
between 2500 and 5000 SMTP connection attempts a day, of which about 100
are genuine. An average of about 1.5 spams a day make it through to my
Inbox, and Icedove spots almost all of them. That's for a couple of
seconds of exim4 run time a day, on a dual-2.8G CPU machine with half a
gig of RAM. To be honest, the CIDR block checking is a bit of a hobby of
mine, and only accounts for about half a dozen spams a day, while the
DNS check alone kills about 40% of them and takes a fraction of the time.
My ISP uses a commercial anti-spam service, and I check the webmail for
that domain every couple of weeks or so to avoid innocent people getting
NDR spam, and without any doubt, exim4 does a far better job than their
service.
--
Joe
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