Re: Exchange - multiple relay?

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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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