Are the devices overworked with outgoing email? If not, I would not worry about 
that.

From: Sean Martin [mailto:seanmarti...@gmail.com]
Sent: Thursday, January 20, 2011 1:05 PM
To: MS-Exchange Admin Issues
Subject: Re: SMTP Load Balancing - Barracuda

That sounds likely, I just don't see anywhere within the GUI to control that 
behaivor.

- Sean
On Thu, Jan 20, 2011 at 8:55 AM, Kennedy, Jim 
<kennedy...@elyriaschools.org<mailto:kennedy...@elyriaschools.org>> wrote:
Cuda's caching the dns lookup?

From: Sean Martin [mailto:seanmarti...@gmail.com<mailto:seanmarti...@gmail.com>]
Sent: Thursday, January 20, 2011 12:43 PM
To: MS-Exchange Admin Issues
Subject: SMTP Load Balancing - Barracuda

Good morning all,

I've got two Barracuda SPAM/Virus Firewalls that I'm trying to setup for load 
balancing outgoing mail. The Barracuda's forward mail to a smarthost, and since 
they're clustered, I can't specify separate smart hosts per device. Barracuda 
documentation indicates this is accomplished using MX records. I created an MX 
record named testmx.domain.com<http://testmx.domain.com/> and two A records 
both named test.domain.com<http://test.domain.com/>, one for each of the 
downstream smart hosts. However, both of the barracuda's appear to favor only 
one of the smart hosts when delivering outgoing mail.

Repeated NSLookups against the MX record seem to alternate between the A 
records as expected. Any ideas on why this wouldn't work?

- Sean

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