Interspire Email Marketer allows you to choose how emails are sent out: either using PHP's built-in mail() function or by specifying an SMTP server. You can specify a different SMTP server for each user account, or you can specify one from the settings page that all accounts will use.
If you choose to use an SMTP server Interspire Email Marketer will use its own integrated email engine to send emails using minimal server resources. You can learn more about the sending engine here.

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