Configuring the Queue Manager

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To configure the Queue manager:

1. In IMail Administrator, expand the Services folder in the left panel, and select Queue Manager. The Queue Manager tab appears in the right panel, as shown below.

2. Enter the options you want to use to configure the Queue Manager. Each option is described at the end of this procedure.
3. Click Apply to save your changes.
4. After making changes, stop the service, wait 5-10 seconds and restart the service. Any changes that you make are saved automatically as soon as you press the Stop/Start button.

Options

Delivery Threads. The total number of threads that will be used to deliver messages. Each thread processes one message at a time. The minimum value for this option is 5.

Maximum retry threads. The maximum number of delivery threads that can be used at one time when the system retries to deliver messages in the queue. The value for this option cannot be greater than the number of delivery threads and cannot be less than 2.

Listen Pipes. The number of pipes that the queue manager opens in order to listen for files being dropped in the queue by other processes. The minimum value for this option is 2 and the maximum value is 20. A value of 4 should be sufficient for most servers, but the number can be increased for better performance on very busy servers. If a server starts a queue run and the queue run finds new files in the queue, then this value should be increased.

Retry timer (minutes). This is how often, in minutes, the queue manager will attempt to resend messages that failed to be delivered on previous queue runs. The minimum value for this option is 10 and the maximum value is 120.

Daily Report Address. IMail Server has the ability to compile and send daily reports that detail server activity. These reports are sent once a day, 30 seconds after the date changes, to the e-mail address specified in this text box, if no address is entered, no report will be sent.The following information is included in the report:

• SpamContent-The number of statistical filtering matches.
• SpamPhrase- The number of phrase filtering matches.
• Virus- The number of viruses caught by IMail Anti-Virus.
• LocalDeliver- The number of local deliveries.
• RemoteDeliver- The number of remote deliveries.
• SpamFeatures- The number of e-mails containing the selected HTML features.
• SpamHREFDomain- The number of e-mails containing an HTML link to one of the domains listed in the HREF domain black list.

DNS Cache Options

The DNS Cache is an internal cache of positive DNS queries. The cached DNS response will remain active for the amount of the time to live (TTL) entry from the DNS.

• Enabled (enabled by default). Select this option to enable the DNS cache. Enabling this option will improve delivery performance since positive queries will be cached and reused. To disable this option, clear the check box.
• Max Entries. The total number of entries allowed in the DNS cache. The DNS cache is a first in, first out list, so the list is updated as new DNS queries are performed. The default value is 200, but you can enter any value between 5 and 5000.
• Clear Cache button. Click this button to clear the DNS cache in the queue manager. This is usually not required.

Failed Domain Skipping Options

• Enabled (enabled by default). Select this option to enable the Failed Domain Skipping feature. To disable this option, clear the check box. We recommend that you enable this option since it increases performance when many messages are destined for un-reachable hosts.
• Max Entries. The total number of entries allowed in the skip list. This is a first in, first out list that is updated as new domains are added. The default value for this option is 500, but you can enter any value between 5 and 5000.
• Skip Time. The amount of time, in minutes, that failed domains will be skipped before re-attempting delivery. The default value is 30 minutes, but you can enter any value between 2 and 240 minutes.
• Clear skip list button. Click this button to clear the skip list from memory. This is not normally not required.

Note: You must stop and restart the Queue Manager service in order for your changes to take effect.

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