默认值wp_mail() 函数是可插入的，这意味着它可以被插件完全覆盖。但是，在没有任何外部影响的情况下，电子邮件地址的“发件人”设置是硬编码的。

以下是/wp-includes/pluggable.php:

// From email and name
// If we don\'t have a name from the input headers
if ( !isset( $from_name ) )
    $from_name = \'WordPress\';

/* If we don\'t have an email from the input headers default to wordpress@$sitename
 * Some hosts will block outgoing mail from this address if it doesn\'t exist but
 * there\'s no easy alternative. Defaulting to admin_email might appear to be another
 * option but some hosts may refuse to relay mail from an unknown domain. See
 * http://trac.wordpress.org/ticket/5007.
 */

if ( !isset( $from_email ) ) {
    // Get the site domain and get rid of www.
    $sitename = strtolower( $_SERVER[\'SERVER_NAME\'] );
    if ( substr( $sitename, 0, 4 ) == \'www.\' ) {
        $sitename = substr( $sitename, 4 );
    }

    $from_email = \'wordpress@\' . $sitename;
}

// Plugin authors can override the potentially troublesome default
$phpmailer->From     = apply_filters( \'wp_mail_from\'     , $from_email );
$phpmailer->FromName = apply_filters( \'wp_mail_from_name\', $from_name  );

它说明了如何设置发件人名称和电子邮件。默认情况下，邮件是使用以下地址从“WordPress”发送的[email protected] ... 无论什么sitename.url 可能是你的情况plugin route, 您可以在主题或drop-in MU plugin.

add_filter( \'wp_mail_from\', \'wp44834_from\' );
function wp44834_from( $from_email ) {
    return "[email protected]";
}

add_filter( \'wp_mail_from_name\', \'wp44834_from_name\' );
function wp44834_from_name( $from_name ) {
    return "Bob";
}

WordPress默认使用php邮件。要使用SMTP，您需要使用一个单独的插件，其中有几个可用的-搜索WordPress。组织并找到一个适合您需要的。