When you try to send a message with a large attachment to a large list of members it causes bottlenecks on your network due to the high volume of traffic and you'd like to know how to throttle ListManager in order to prevent this from happening.
The following settings can be adjusted to control the flow of mail and resource utilization of your ListManager server. Every environment has its own unique configuration and limitations, therefore this article cannot make specific recommendations but rather provides the information necessary for you to configure ListManager according to your needs.
- Log on to ListManager as an Administrator
- Navigate to Utilities > Administration > Server > Server Settings > Machine/Node Settings > Limits and adjust any of the following settings:
Maximum megabits: The average maximum megabits per second (Mbps) ListManager should use. By default, this setting is "0", meaning ListManager will use as much bandwidth as necessary.
In some circumstances, ListManager may use all of your bandwidth, limiting other web applications. If you have bandwidth limitations and would like to prevent ListManager from using all of your bandwidth, enter the amount of bandwidth (in Mbps) it should be allowed to use on average.
Note that this feature regulates the average bandwidth used by the server. If you are sending out very large messages, ListManager will send each one as quickly as possible, but then will be idle for a period so that its average bandwidth is what is set here. If you must eliminate large bandwidth spikes as well as regulate your average bandwidth usage, you should consider a hardware solution (a managed switch with rate-limiting).
Maximum messages per hour: The number of messages your license permits you to send per hour. By default, ListManager will be set to use the maximum number of messages per hour permitted by your license. This setting allows you to lower the maximum number of messages per hour ListManager will send.
Contact the Renewals Team for more information about increasing the maximum number of messages per hour.
Maximum simultaneous sends: Controls the number of simultaneous email messages ("sends") that can be sent at once. By default, ListManager will be set to use the maximum simultaneous sends for your license.
In general, the maximum allowed by your license will be sufficient. However, if you are finding that your bandwidth or firewall is being overtaxed by ListManager, you may want to set Maximum simultaneous sends lower.
If you are running a site that has a very large number of one-off messages, such as autoresponders, or many subscriptions, you may want to increase the number. Contact the Renewals Team for more information about increasing your maximum simultaneous sends.
Maximum CPU bound threads: Configures the number of threads ListManager is capable of using for DomainKeys signing in the background.
Maximum SQL Threads: Configures the number of threads ListManager is capable of using for SQL query execution in the background.