diff --git a/include/follow.php b/include/follow.php
index 3045191077..11138afac8 100644
--- a/include/follow.php
+++ b/include/follow.php
@@ -82,6 +82,11 @@ function new_contact($uid,$url,$interactive = false) {
 		return $result;
 	}
 
+	if (! check_domain_blocklist($url)) {
+		$result['message'] = t('Blocked domain');
+		return $result;
+	}
+
 	if (! $url) {
 		$result['message'] = t('Connect URL missing.');
 		return $result;
diff --git a/include/network.php b/include/network.php
index f9d35c52c3..a362f0307c 100644
--- a/include/network.php
+++ b/include/network.php
@@ -454,13 +454,14 @@ function allowed_url($url) {
 
 	$h = @parse_url($url);
 
-	if(! $h) {
+	if (! $h) {
 		return false;
 	}
 
-	$str_allowed = get_config('system','allowed_sites');
-	if(! $str_allowed)
+	$str_allowed = get_config('system', 'allowed_sites');
+	if (! $str_allowed) {
 		return true;
+	}
 
 	$found = false;
 
@@ -468,16 +469,17 @@ function allowed_url($url) {
 
 	// always allow our own site
 
-	if($host == strtolower($_SERVER['SERVER_NAME']))
+	if ($host == strtolower($_SERVER['SERVER_NAME'])) {
 		return true;
+	}
 
 	$fnmatch = function_exists('fnmatch');
-	$allowed = explode(',',$str_allowed);
+	$allowed = explode(',', $str_allowed);
 
-	if(count($allowed)) {
-		foreach($allowed as $a) {
+	if (count($allowed)) {
+		foreach ($allowed as $a) {
 			$pat = strtolower(trim($a));
-			if(($fnmatch && fnmatch($pat,$host)) || ($pat == $host)) {
+			if (($fnmatch && fnmatch($pat, $host)) || ($pat == $host)) {
 				$found = true;
 				break;
 			}
@@ -486,6 +488,37 @@ function allowed_url($url) {
 	return $found;
 }
 
+/**
+ * Checks if the provided url domain isn't on the domain blacklist.
+ * Return true if the check passed (not on the blacklist), false if not
+ * or malformed URL
+ *
+ * @param string $url The url to check the domain from
+ * @return boolean
+ */
+function check_domain_blocklist($url) {
+	$h = @parse_url($url);
+
+	if (! $h) {
+		return false;
+	}
+
+	$domain_blocklist = get_config('system', 'blocklist', array());
+	if (! $domain_blocklist) {
+		return true;
+	}
+
+	$host = strtolower($h['host']);
+
+	foreach ($domain_blocklist as $domain_block) {
+		if (strtolower($domain_block['domain']) == $host) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
 /**
  * @brief Check if email address is allowed to register here.
  *
diff --git a/mod/dfrn_request.php b/mod/dfrn_request.php
index f3875ed8e4..68f9448a55 100644
--- a/mod/dfrn_request.php
+++ b/mod/dfrn_request.php
@@ -514,6 +514,11 @@ function dfrn_request_post(App $a) {
 					return; // NOTREACHED
 				}
 
+				if (! check_domain_blocklist($url)) {
+					notice( t('Blocked domain') . EOL);
+					goaway(App::get_baseurl() . '/' . $a->cmd);
+					return; // NOTREACHED
+				}
 
 				require_once('include/Scrape.php');