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Configuring Inbound Multi-SMTP Profiles


Applies to: Forefront Online Protection for Exchange

Topic Last Modified: 2012-08-17

In Forefront Online Protection for Exchange (FOPE), you must specify an incoming mail server IP address for each domain in your company. This is so your inbound email messages can be delivered after they have been filtered. If you have multiple mail server IP addresses, you can create an inbound multi-SMTP profile that will cause email to be delivered to multiple mail servers in your network by using what is known as round-robin load balancing. You can create multiple multi-SMTP profiles for a single company.

Round-robin load balancing will select different IP addresses to connect to if the mail server delivering messages to your domain is required to open multiple connections to transfer multiple messages. However, this is dependent on two requirements:

  1. The mail server initiating conversation must be aware that the other IP has already been contacted.

  2. The weight on the IPs must be equal; otherwise, it will continue attempting to connect to the lowest-weighted IP.

When you configure a secondary lower weighted connection, the IP with the lowest number (lowest weight) is preferred. Any higher-weighted IP addresses will be used only if the lower-weighted IP address fails to respond to the connection attempt.
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