Re: Exchange - multiple relay?

Hi Cliff, thank you for your input.

1) Yes, I want to change the way I send mail from a forward to ISP to DNS.
That makes me change DNS and MX cause of reversedns and other spam security
checks.

2) If my exchange sends mail by DNS it has to be accessible from the
outside, right? I opened my firewall in port25 for the servers IP for it to
work.

3) The second machine outside our LAN is not an exchange box, just a
server2003 with smtp. I also agree with you qith the load balance. I've
lookup some routers with dual wan and load balance, maybe this could help me.

4) It's 50 users sending newsletters and press releases to thousends of
adresses (again, not spam...) some of them with 4MB attahments... The router
graphics don't lie! When they it the send button the traffic goes to the top
and stays there until the exchange queue is clean. "Unfortunatly" is not a
virus...
--
Paulo


"Cliff Galiher" wrote:

A couple of things:

1) Inbound traffic and outbound traffic are two different things. It sounds
like you want to change how you send mail, so MX and DNS will not change.

2) Along those lines, keeping your exchange box inaccessible from the
outside in this scenario is also easy to do, but is a configuration for your
firewall, not exchange itself.

3) Adding a second exchange box won't help you with two links. The problem
is that exchange's message delivery, even with multiple machines, would be
decided *before* netowrk load was taken into account, and complicating your
setup as well...for little gain. You should instead be configuring your
front-end device (ISA, router, firewall appliance) for network load
balancing. That way a single exchange box can do what it does, look up MX
records, request to open an SMTP connection, and the firewall can decide
which link to open that SMTP connection through.

4) 700kbps upstream is a lot of bandwidth for mail in an SBS environment.
One of my smaller customers is a 5-machine SBS client, but runs a mailing
list with hundreds of thousands (100,000+) subscribers...and they only have
a 256k link. It can take about an hour to send their newsletter when it
fires off...but all of that happens on the sending end, so receiving servers
aren't having issues. Are you sure you don't have othe problems??
Compromised client saturating your bandwidth??

-Cliff

"Paulo" <Paulo@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:BD36002B-97CC-4311-A2E6-B16F94600466@xxxxxxxxxxxxxxxx
Hi trhere!
It's a "business connection" for the ISP but it's ADSL 24Mbps download and
1Mbps upload (true is 700Kbps) with fixed IP.

Using a smarthost gives me a problem cause whenenver there is a faillure
the
providers "never have problems", it´s allways on the client side.
Meanwhile
the time passes and I can´t solve things and people try to kill me in
these
parts...

Anyway, the smarthost will allways be limited by my upload speed and on
this
side of the world my connection costs about 100$USD and a 2Mbps/2Mbps
costs
1000$USD!

I would prefer have the relays on my side and preferibly 2 internet
connections.
--
Paulo


"Cris Hanna (SBS-MVP)" wrote:

You could explore using a different SMTP SmartHost
http://www.dyndns.com/services/mailhop/outbound.html

is yoru SBS server connected to the internet on a residential or business
connection??

--
Cris Hanna [SBS-MVP]
-------------------------------------------------
Microsoft MVPs
Independent Experts (MVPs do not work for MS)
Real World Answers
---------------------------------------------------------
Please do not contact me directly regarding issues


"Paulo" <Paulo@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:83FCB643-2DD1-4644-A26D-37C72D2D67D1@xxxxxxxxxxxxxxxx
Hi All.
I´ve an SBS2003 with exchange working fine with pop3 conector and an
smpt
relay to my ISP. This works fine until my ISP start restricting mail
sending
(recipient per message, mails for hour, ...)
Because pur company needs to send a large number of emails [we are not
spammers : ) ] we need to change this solution.
So I tested using exchange to send mails directly what worked fine
until our
upload reached the limit.

How the ideia was to test, it's all right but i don´t want to leave my
exchange reachable from the internet for security and performance
reasons so
I need your input.

Putting a 2003 (or 2008) server with smtp on a dmz and use relay is the
logical thing to do but...
- Were can I get all the info on how to set this up with security?
- Is it possible to use two fixed ip internet connections
simultaneously to
have more upload speed (dedicated lines are expensive)?
- If so, what should the MX record and DNS look like?

Sorry for all the questions but I would like to do this by the rules!
Thanks in advance.
--
Paulo

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