以下をfunctions.phpへ記載

[php] add_filter( ‘wpcf7_validate_email’, ‘wpcf7_text_validation_filter_extend’, 11, 2 ); add_filter( ‘wpcf7_validate_email*’, ‘wpcf7_text_validation_filter_extend’, 11, 2 ); function wpcf7_text_validation_filter_extend( $result, $tag ) { global $my_email_confirm; $tag = new WPCF7_Shortcode( $tag ); $name = $tag->name; $value = isset( $_POST[$name] ) ? trim( wp_unslash( strtr( (string) $_POST[$name], "\n", " " ) ) ) : ”; //ひとつ目のメールアドレス項目の名称（ここでは’your-email’）を$nameに代入。 if ($name == "your-email"){ $my_email_confirm=$value; } //ふたつ目のメールアドレス項目の名称（ここでは’your-email_confirm’）を$nameに代入。 if ($name == "your-email_confirm" && $my_email_confirm != $value){ $result->invalidate( $tag,"確認用のメールアドレスが一致していません"); } return $result; } [/php]

フォームに[email* your-email_confirm]を貼り付け完了