diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 459c8f5..acf3629 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -1869,20 +1869,26 @@
 			return FALSE;
 		}
 
-		$this->_send_command('from', $this->clean_email($this->_headers['From']));
+		if ( ! $this->_send_command('from', $this->clean_email($this->_headers['From'])))
+		{
+			return FALSE;
+		}
 
 		foreach ($this->_recipients as $val)
 		{
-			$this->_send_command('to', $val);
+			if ( ! $this->_send_command('to', $val))
+			{
+				return FALSE;
+			}
 		}
 
 		if (count($this->_cc_array) > 0)
 		{
 			foreach ($this->_cc_array as $val)
 			{
-				if ($val !== '')
+				if ($val !== '' && ! $this->_send_command('to', $val))
 				{
-					$this->_send_command('to', $val);
+					return FALSE;
 				}
 			}
 		}
@@ -1891,14 +1897,17 @@
 		{
 			foreach ($this->_bcc_array as $val)
 			{
-				if ($val !== '')
+				if ($val !== '' && ! $this->_send_command('to', $val))
 				{
-					$this->_send_command('to', $val);
+					return FALSE;
 				}
 			}
 		}
 
-		$this->_send_command('data');
+		if ( ! $this->_send_command('data'))
+		{
+			return FALSE;
+		}
 
 		// perform dot transformation on any lines that begin with a dot
 		$this->_send_data($this->_header_str.preg_replace('/^\./m', '..$1', $this->_finalbody));
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 7c671c0..bdde1ca 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -21,6 +21,7 @@
 -  Fixed a bug where the :doc:`Database Class <database/index>` entered an endless loop if it fails to connect with the 'sqlsrv' driver.
 -  Fixed a bug (#4065) - :doc:`Database <database/index>` method ``protect_identifiers()`` treats a traling space as an alias separator if the input doesn't contain ' AS '.
 -  Fixed a bug (#4066) - :doc:`Cache Library <libraries/caching>` couldn't fallback to a backup driver if the primary one is Memcache(d) or Redis.
+-  Fixed a bug (#4073) - :doc:`Email Library <libraries/email>` method ``send()`` could return TRUE in case of an actual failure when an SMTP command fails.
 
 Version 3.0.1
 =============