Re: postfix mail server

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 01/15/08 04:27, Stephane Durieux wrote:
hello,

Building a mail server for 200/300 users (able to grow
till a thousand) and as a newbie I need an advice

How many mails per day?

My choice a turned to postfix with virtual mailboxes,
courrier-imaps, squirrel mail (https), postgrey and
dspam spam, amavis and clamav against virus, iptables
for undesired packets.

Marking spam so the user can examine it, or immediately toss the "spam"?

The "framework" is this one :
all on the mail server except squirrelmail

The problem is that someone has adviced me to put
instead a front device with squirrelmail with iptables
and squirrelmail with a ssh tunnel to smtp and imap
services

But I don t really understand the gain of that
framework in terms of security or performance

If someone can help me

How big will the hardware be? ISTM that modern systems have *more*
than enough CPU & RAM to host all of that on one box. It's the
disk IO that might be the bottleneck.

If you simply make spam "go away", then you'll lighten the IO load
*quite* a bit, but marking it and letting the user delete it will
significantly *increase* the IO load.

Let's do some math.
U = 1000 (Number of users)
Es = 250 (Number of spam mails per day)
Eh = 50 (Number of ham mails per day)
S = 16384 (Average size of an html email)

So, if you keep spam, the total GB per day that you are writing is:
W = U*(Es+Eh)*S/2^30 = 4.58 GB

Triple that, because obviously the purpose is to do more than store
email.
IO = W*3 = 13.74 GB

If most email reading is done in the 9 hour work day, then that's an
average of 13.74/9 = 1.53GB/hour.

The standard SATA drive can easily sustain 60MB/s throughput.

60*2^20*3600/2^30 = 211GB/hr throughput.

So, even if I'm way underestimating your mail volume, current SATA
drives should be more than adequate to the task.

Also, remember that you can start with squirrelmail on the mail
server, but move it to a different box if the burden is too heavy.

- --
Ron Johnson, Jr.
Jefferson LA USA

"I'm not a vegetarian because I love animals, I'm a vegetarian
because I hate vegetables!"
unknown
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFHjL2PS9HxQb37XmcRAn0JAJwKtEglRbXlHflas0CQZT5YLRRANACfaozO
3RVoEv/iE+ulLSVT4/+ADWI=
=Azz1
-----END PGP SIGNATURE-----


--
To UNSUBSCRIBE, email to debian-user-REQUEST@xxxxxxxxxxxxxxxx
with a subject of "unsubscribe". Trouble? Contact listmaster@xxxxxxxxxxxxxxxx

Relevant Pages

  • Re: Found the problem
    ... if you are on SBS 2003, Exchange has IMF for filtering out spam. ... >> Host Name Priority Mail Server ... >> I followed their advice, and we stopped receiving external email. ...
    (microsoft.public.backoffice.smallbiz2000)
  • postfix mail server
    ... Building a mail server for 200/300 users (able to grow ... till a thousand) and as a newbie I need an advice ... instead a front device with squirrelmail with iptables ... To UNSUBSCRIBE, email to debian-user-REQUEST@xxxxxxxxxxxxxxxx ...
    (Debian-User)
  • Re: content filtering
    ... opinion on experience that's limited to dealing with domestic US ... Considering that the large majority of spam originates from the US, ... Now all you need is some method of identifying the sender. ... 550 code would come to the attention of the mail server admin who could ...
    (microsoft.public.exchange.admin)
  • Re: anti spam sw?
    ... It only tags suspect mail as spam. ... Bayesian filtering should ALWAYS be the *last* mechanism used to detect spam since it is a guessing scheme based on word weigthing over a historical sample set experienced by just one particular user. ... I also use the MXblocking plug-in because I don't want mails sent from dynamically IP addressed hosts. ... If someone wants to operate their own mail server then let them get a static IP address. ...
    (alt.computer.security)
  • Re: Outlook Express Undeliverable
    ... If your client is not getting an NDR message back from ... his mail server (which means his sending mail server got rejected during the ... Maybe you have server-side spam filtering enabled and his mails ... sender is infected so his mails could also be infected. ...
    (microsoft.public.internet.mail)