I purchase a Barracuda 300 and cannot get the outbound mail to relay through the Barracuda.
#Exchange 2010 smarthost windows#
If a smart hosted SMTP Send Connector has multiple smart hosts defined, load balancing and fault tolerance are accomplished using these smart hosts.I have an Exchange 2010 SP1 environment on a Windows 2008 R2 server. When multiple smart hosts are configured on a single Send Connector the outgoing email will be correctly load balanced. Or if the smart hosts are actually hosted by the ISP then the Send Connector simply specifies the IP addresses or DNS names of the smart hosts, and the Exchange source servers would need static routes configured to be able to reach each smart host over the correct ISP connection. If the smart hosts are on your own network then they are configured to route to the internet via their respective ISP connection. If multiple equal cost connectors are available to route email, E2007 Routing picks one of the connectors deterministically… Mail will not be load balanced among multiple equal cost connectors. So what is the solution?īetter to spread load across both locations, to keep both sets of addresses “warm” Load Balancing Outgoing Email with Exchange Server
In other words unless you are continually sending email out both of your email routes you might create new problems for yourself when you start using the backup connection. If you treat a second location as a cold standby, only used when your main ISP breaks, expect to see serious delivery problems as you migrate across to it. You need to be sending email fairly consistently from an IP address in order to maintain a decent reputation for that mail source. This connection can either be activated during an outage of their primary link, or be configured as a secondary route that will be automatically used if the primary route is down.Īlthough this seems like a simple win it can cause problems with email delivery because of IP reputation issues.
To achieve this most organizations will simply provision a backup internet connection for their network. Some organizations wish to deploy complete end to end redundancy for their Exchange environment, including the outgoing routes to the internet. The article has been retrieved from the internet archive, thanks to Tostka in the comments below. Note: this blog post written by me originally appeared on All Spammed Up, which is no longer an active website. The correct solution is to deploy a single Send Connector with multiple smart hosts. When the cost of the Send Connectors and the proximity to their source servers are the same, Exchange will simply choose the one with the alphanumerically lower connector name, and will not load balance the outgoing email across both connections. A common misconception is that outbound email can be load-balanced for Exchange simply by provisioning two equal cost Send Connectors, either using DNS to route directly or routing via a smart host for each Send Connector.
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