Книга: Fedora™ Unleashed, 2008 edition

Setting Message Delivery Intervals

Setting Message Delivery Intervals

As mentioned earlier, Sendmail typically attempts to deliver messages as soon as it receives them, and again at regular intervals after that. If you have only periodic connections to the Internet, as with a dialup connection, you likely would prefer that Sendmail hold all messages in the queue and attempt to deliver them at specific time intervals or at your prompt. You can configure Sendmail to do so by adding the following line to sendmail.mc:

define(`confDELIVERY_MODE', `d')dnl

This line causes Sendmail to attempt mail delivery only at regularly scheduled queue processing intervals (by default, somewhere between 20 and 30 minutes).

However, this delay time might not be sufficient if you are offline for longer periods of time. In those situations, you can invoke Sendmail with no queue processing time. For example, by default, Sendmail might start with the following command:

# sendmail -bd -q30m

This tells Sendmail that it should process the mail queue (and attempt message delivery) every 30 minutes. You can change 30 to any other number to change the delivery interval. If you want Sendmail to wait for a specific prompt before processing the queue, you can invoke Sendmail with no queue time, like this:

# sendmail -bd -q

This command tells Sendmail to process the queue once when it is started, and again only when you manually direct it to do so. To manually tell Sendmail to process the queue, you can use a command like the following:

# sendmail -q

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