diff --git a/inc/config.php b/inc/config.php
index 454cae4f..43bd7f69 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -576,8 +576,14 @@
 
 	// Maximum numbers of threads that can be created every hour on a board.
 	$config['max_threads_per_hour'] = 30;
+	// Maximum OP body length.
+	$config['max_body_op'] = 1800;
+	// Minimum OP body length. Ignored if force_body_op is set to false.
+	$config['min_body_op'] = 0;
 	// Maximum post body length.
 	$config['max_body'] = 1800;
+	// Minimum post body length.
+	$config['min_body'] = 0;
 	// Maximum number of lines allowed in a post.
 	$config['maximum_lines'] = 100;
 	// Maximum number of post body lines to show on the index page.
diff --git a/post.php b/post.php
index 62b929d1..6d05594b 100644
--- a/post.php
+++ b/post.php
@@ -955,16 +955,36 @@ if (isset($_POST['delete'])) {
 
 	if (!$dropped_post) {
 		// Check string lengths
-		if (mb_strlen($post['name']) > 35)
+		if (mb_strlen($post['name']) > 35) {
 			error(sprintf($config['error']['toolong'], 'name'));
-		if (mb_strlen($post['email']) > 40)
+		}
+		if (mb_strlen($post['email']) > 40) {
 			error(sprintf($config['error']['toolong'], 'email'));
-		if (mb_strlen($post['subject']) > 100)
+		}
+		if (mb_strlen($post['subject']) > 100) {
 			error(sprintf($config['error']['toolong'], 'subject'));
-		if (!$mod && mb_strlen($post['body']) > $config['max_body'])
-			error($config['error']['toolong_body']);
-		if (!$mod && substr_count($post['body'], "\n") >= $config['maximum_lines'])
-			error($config['error']['toomanylines']);
+		}
+		if (!$mod) {
+			$body_mb_len = mb_strlen($post['body']);
+			$is_op = $post['op'];
+
+			if (($is_op && $config['force_body_op']) || (!$is_op && $config['force_body'])) {
+				$min_body = $is_op ? $config['min_body_op'] : $config['min_body'];
+
+				if ($body_mb_len < $min_body) {
+					error($config['error']['tooshort_body']);
+				}
+			}
+
+			$max_body = $is_op ? $config['max_body_op'] : $config['max_body'];
+			if ($body_mb_len > $max_body) {
+				error($config['error']['toolong_body']);
+			}
+
+			if (substr_count($post['body'], '\n') >= $config['maximum_lines']) {
+				error($config['error']['toomanylines']);
+			}
+		}
 	}
 	wordfilters($post['body']);