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SMTP load balance/fault tolerance

Masen
10/27/2004 4:27:02 PM

iis smtp nntp: What is the best method for load balancing outgoing smtp connections from IIS
6 SMTP when using smarthost forwarding? Most products I've worked with in
the past allowed for the entry of multiple destinations when forwarding to a
smarthost. However, Microsoft SMTP will only allow a single entry in the
smarthost field. I want to forward to two separate servers, load balance
between them and gracefully handle the failure of one of the destinations.

My first thought was NLBS on the destination servers, allowing the entry of
1 IP in the smarthost field. However, I'm unable to get multicast/IGMP
working with the switches I have, and am worried about the broadcast traffic

Re: SMTP load balance/fault tolerance

Bronek Kozicki
10/28/2004 9:44:45 AM

[quoted text, click to view]

if these two servers are yours, you might set them up in single WLBS (IP
load balancing).

Re: SMTP load balance/fault tolerance

m.marien
10/28/2004 4:26:05 PM

[quoted text, click to view]

Just select "Attempt direct delivery before ...". This would use the normal
methods. If there is more than one MX record for the domain, load balancing
is taken care of in DNS. It also solves the server down problem.

Of course you could achieve the same thing by not specifying a smart host
and just letting SMTP deliver directly. Is there a reason for using a
smarthost ?

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