2 Exchange 2010 HUB and IMSS

Kanchana_Silva
Kanchana_Silva used Ask the Experts™
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hello Guys,

we have 2 Exchange 2010 HUB/CAS servers. We use TrendMicro IMSS server as a SPAM gateway. We want to pass all the emails to HUB servers that are comming from the internet. Only problem is how can we point both HUB servers ?

Regards
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NenadicCTO

Commented:
There are a few things you can do.

Public MX Records
The best and simplest would be to just have two MX records, pointing to your Hub Transport servers (or firewall or NAT device - whatever you have on the network boundary). You could either put them at the same value (e.g. 10) which would be as close to load balancing them, or you could prioritise one of them (so, values would be 10 and 20 where 10 is the first tried).
The thing to consider, though, is that if you have a single firewall in front of them, you retain a single point of failure.

Internal MX Records
Depending on your setup, you could also leverage MX records in your internal name resolution space, allowing the edge device - e.g. firewall - to load balance inbound traffic.

Load Balancers
You could use something as simple as Windows Network Load Balancing to have a shared IP address that could be used as a resolution point for a single MX record. Alternatively, you could use proper hardware load balancers, like F5 or Kemp.

Author

Commented:
hello ,

i think you didn't get my question yet. Actually my Mail Gateway is located at DMZ network.Its a software and we have point HUB servers on the Mail gateway server. We have 2 HUB servers here. So i am asking what is the best practice to point HUB servers on the IMSS servers.

NenadicCTO

Commented:
So, you are talking about outbound mail, not inbound? Send Connectors, in other words? If so, you create one Send Connector in the Hub Transport settings at Organization level. Specify IMSS as smarthost (they will have provided you with a hostname for their towers). Ensure both Hub Transport servers are selected as sources.
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Author

Commented:
No, iam talking abt inbound emails. When all emails will be come to IMSS servers, then IMSS servers will pas all email to HUB servers. When we point HUB servers, how can we point them because we have 2 HUB servers. Please advice on this ?

regards
NenadicCTO

Commented:
OK, so why can't you use part of the first suggestion about load-balanced servers? You can use NLB or a hardware load balancer.

What have you got between your DMZ and internal network? A firewall or a proxy or something else?

Author

Commented:
We cant use WNLB becox We use WNLB for CAS array.  
We cant use hardware Load Balancer because they dont have budget for that .
NenadicCTO

Commented:
Why couldn't you use WNLB if you already use it for CAS array?

Could you also let me know what you have between DMZ and internal network?

Author

Commented:
Mictosoft dosent recomand to use port 25 on WNLB if that is use for CAS array.
CTO
Commented:
That recommendation refers to using the VIP for intra-Exchange Organization communication, which you won't be doing. You will only refer to that VIP from external IMSS service.

This is from the article http://technet.microsoft.com/en-us/library/bb124398(EXCHG.140).aspx:
Load balancing of inbound SMTP connections for POP and IMAP client connections to the default Receive connector named "Client <Server Name>" that is created only on Hub Transport servers.
Load balancing of inbound SMTP connections for applications that submit e-mail to the Exchange organization.
Yours is the second case.

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