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I am very new to WP.How does a confirmation mail is sent during user registration.Is there any services being worked out here. is this a free service using php for any plugin.

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Wordpress uses by default wp_mail()source which is a PHP function very similar to the native PHP mail. Hence this service is provided by your server/host.

This function is, however, pluggable, which means it can be overridden by plugins and custom functions, so it might be slightly different in your case.

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