Switch to the Publish view by clicking the Publish header.
Click the Options and Performances button. If you are on a cable modem or consumer service provider, you may want to set the number of threads to 1 (default is Automatic) since your provider may restrict the number of mail connections made at once. You may specify the delivery mode to Direct/Mixed Mailing from Relay Mailing to enable the built-in SMTP engine.
Click OK to close the preference dialog.

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