diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index 396952ace9c..878e0372ab3 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -55,7 +55,6 @@ class CMailFile
 
 	var $eol;
 	var $eol2;
-	var $atleastonefile=0;
 	var $error='';
 
 	var $smtps;			// Contains SMTPs object (if this method is used)
@@ -74,7 +73,7 @@ class CMailFile
 	// Image
 	var $html;
 	var $image_boundary;
-	var $atleastoneimage=0;
+	var $atleastoneimage=0;    // at least one image file with file=xxx.ext into content (TODO Debug this. How can this case be tested. Remove if not used).
 	var $html_images=array();
 	var $images_encoded=array();
 	var $image_types = array('gif'  => 'image/gif',
@@ -108,7 +107,7 @@ class CMailFile
 	 */
 	function __construct($subject,$to,$from,$msg,$filename_list=array(),$mimetype_list=array(),$mimefilename_list=array(),$addr_cc="",$addr_bcc="",$deliveryreceipt=0,$msgishtml=0,$errors_to='',$css='',$trackid='',$moreinheader='')
 	{
-		global $conf;
+		global $conf, $dolibarr_main_data_root;
 
 		// We define end of line (RFC 821).
 		$this->eol="\r\n";
@@ -160,8 +159,12 @@ class CMailFile
 		if ($this->msgishtml)
 		{
 			$this->html = $msg;
-			$findimg = $this->findHtmlImages($conf->fckeditor->dir_output);
 
+            if (! empty($conf->global->MAIN_MAIL_ADD_INLINE_IMAGES_IF_IN_MEDIAS))
+            {
+                $findimg = $this->findHtmlImages($dolibarr_main_data_root.'/medias');
+            }
+            
 			// Define if there is at least one file
 			if ($findimg)
 			{
@@ -231,17 +234,6 @@ class CMailFile
 			// Define body in text_body
 			$text_body = $this->write_body($msg);
 
-			// Encode images
-			$images_encoded = '';
-			if ($this->atleastoneimage)
-			{
-				$images_encoded.= $this->write_images($this->images_encoded);
-				// always end related and end alternative after inline images
-				$images_encoded.= "--" . $this->related_boundary . "--" . $this->eol;
-				$images_encoded.= $this->eol . "--" . $this->alternative_boundary . "--" . $this->eol;
-				$images_encoded.= $this->eol;
-			}
-
 			// Add attachments to text_encoded
 			if ($this->atleastonefile)
 			{
@@ -255,8 +247,8 @@ class CMailFile
 			// comme des injections mail par les serveurs de messagerie.
 			$this->headers = preg_replace("/([\r\n]+)$/i","",$this->headers);
 
-			$this->message = 'This is a message with multiple parts in MIME format.'.$this->eol;
-			$this->message.= $text_body . $images_encoded . $files_encoded;
+			$this->message = $this->eol.'This is a message with multiple parts in MIME format.'.$this->eol;
+			$this->message.= $text_body . $files_encoded;
 			$this->message.= "--" . $this->mixed_boundary . "--" . $this->eol;
 		}
 		else if ($conf->global->MAIN_MAIL_SENDMODE == 'smtps')
@@ -917,7 +909,7 @@ class CMailFile
 
 		$out.= "Content-Type: multipart/mixed; boundary=\"".$this->mixed_boundary."\"".$this->eol2;
 		$out.= "Content-Transfer-Encoding: 8bit".$this->eol2;
-
+		
 		dol_syslog("CMailFile::write_smtpheaders smtp_header=\n".$out);
 		return $out;
 	}
@@ -973,23 +965,23 @@ class CMailFile
 			$out.= "--" . $this->alternative_boundary . $this->eol;
 		}
 
-		if ($this->msgishtml)
-		{
-			// Check if html header already in message
-			$strContent = $this->checkIfHTML($msgtext);
-		}
-		else
-		{
-			$strContent = $msgtext;
-		}
-
 		// Make RFC821 Compliant, replace bare linefeeds
-		$strContent = preg_replace("/(?<!\r)\n/si", "\r\n", $strContent);
+		$strContent = preg_replace("/(?<!\r)\n/si", "\r\n", $msgtext);
 		if (! empty($conf->global->MAIN_FIX_FOR_BUGGED_MTA))
 		{
 			$strContent = preg_replace("/\r\n/si", "\n", $strContent);
 		}
 
+		$strContentAltText = '';
+		if ($this->msgishtml)
+		{
+			$strContentAltText = html_entity_decode(strip_tags($strContent));
+			$strContentAltText = rtrim(wordwrap($strContentAltText, 75, "\r\n"));
+		    
+		    // Check if html header already in message, if not complete the message
+			$strContent = $this->checkIfHTML($strContent);
+		}
+
 		// Make RFC2045 Compliant, split lines
         //$strContent = rtrim(chunk_split($strContent));    // Function chunck_split seems ko if not used on a base64 content
         $strContent = rtrim(wordwrap($strContent));   // TODO Using this method creates unexpected line break on text/plain content.
@@ -999,14 +991,30 @@ class CMailFile
 			if ($this->atleastoneimage)
 			{
 				$out.= "Content-Type: text/plain; charset=".$conf->file->character_set_client.$this->eol;
-				$out.= $this->eol.strip_tags($strContent).$this->eol; // Add plain text message
+				$out.= $this->eol.($strContentAltText?$strContentAltText:strip_tags($strContent)).$this->eol; // Add plain text message
 				$out.= "--" . $this->alternative_boundary . $this->eol;
 				$out.= "Content-Type: multipart/related; boundary=\"".$this->related_boundary."\"".$this->eol;
 				$out.= $this->eol;
 				$out.= "--" . $this->related_boundary . $this->eol;
 			}
+			
+			if (! $this->atleastoneimage && $strContentAltText && ! empty($conf->global->MAIN_MAIL_USE_MULTI_PART))    // Add plain text message part before html part
+			{
+				$out.= "Content-Type: multipart/alternative; boundary=\"".$this->alternative_boundary."\"".$this->eol;
+				$out.= $this->eol;
+				$out.= "--" . $this->alternative_boundary . $this->eol;
+				$out.= "Content-Type: text/plain; charset=".$conf->file->character_set_client.$this->eol;
+			    $out.= $this->eol.$strContentAltText.$this->eol;
+			    $out.= "--" . $this->alternative_boundary . $this->eol;
+			}
+			
 			$out.= "Content-Type: text/html; charset=".$conf->file->character_set_client.$this->eol;
 			$out.= $this->eol.$strContent.$this->eol;
+		
+			if (! $this->atleastoneimage && $strContentAltText && ! empty($conf->global->MAIN_MAIL_USE_MULTI_PART))    // Add plain text message part after html part
+			{
+			    $out.= "--" . $this->alternative_boundary . "--". $this->eol;
+			}
 		}
 		else
 		{
@@ -1016,6 +1024,16 @@ class CMailFile
 
 		$out.= $this->eol;
 
+		// Encode images
+		if ($this->atleastoneimage)
+		{
+		    $out .= $this->write_images($this->images_encoded);
+		    // always end related and end alternative after inline images
+		    $out .= "--" . $this->related_boundary . "--" . $this->eol;
+		    $out .= $this->eol . "--" . $this->alternative_boundary . "--" . $this->eol;
+		    $out .= $this->eol;
+		}
+		
 		return $out;
 	}
 
@@ -1184,14 +1202,15 @@ class CMailFile
 		$extensions = array_keys($this->image_types);
 
 
-		preg_match_all('/(?:"|\')([^"\']+\.('.implode('|', $extensions).'))(?:"|\')/Ui', $this->html, $matches);
+		preg_match_all('/(?:"|\')([^"\']+\.('.implode('|', $extensions).'))(?:"|\')/Ui', $this->html, $matches);  // If "xxx.ext" or 'xxx.ext' found
 
 		if ($matches)
 		{
 			$i=0;
 			foreach ($matches[1] as $full)
 			{
-				if (preg_match('/file=([A-Za-z0-9_\-\/]+[\.]?[A-Za-z0-9]+)?$/i',$full,$regs))
+
+                if (preg_match('/file=([A-Za-z0-9_\-\/]+[\.]?[A-Za-z0-9]+)?$/i',$full,$regs))   // If xxx is 'file=aaa'
 				{
 					$img = $regs[1];
 
diff --git a/htdocs/core/class/smtps.class.php b/htdocs/core/class/smtps.class.php
index e7c7b343ac9..c99ca2c4850 100644
--- a/htdocs/core/class/smtps.class.php
+++ b/htdocs/core/class/smtps.class.php
@@ -1283,15 +1283,23 @@ class SMTPs
 		// Make RFC821 Compliant, replace bare linefeeds
 		$strContent = preg_replace("/(?<!\r)\n/si", "\r\n", $strContent);
 
+		$strContentAltText = '';
+		if ($strType == 'html')
+		{
+			$strContentAltText = html_entity_decode(strip_tags($strContent));
+			$strContentAltText = rtrim(wordwrap($strContentAltText, 75, "\r\n"));
+		}
+		
 		// Make RFC2045 Compliant
 		//$strContent = rtrim(chunk_split($strContent));    // Function chunck_split seems ko if not used on a base64 content
 		$strContent = rtrim(wordwrap($strContent, 75, "\r\n"));   // TODO Using this method creates unexpected line break on text/plain content.
-
+		
 		$this->_msgContent[$strType] = array();
 
 		$this->_msgContent[$strType]['mimeType'] = $strMimeType;
 		$this->_msgContent[$strType]['data']     = $strContent;
-
+		$this->_msgContent[$strType]['dataText'] = $strContentAltText;
+		
 		if ( $this->getMD5flag() )
 		$this->_msgContent[$strType]['md5']      = dol_hash($strContent, 3);
 		//}
@@ -1304,6 +1312,8 @@ class SMTPs
 	 */
 	function getBodyContent()
 	{
+	    global $conf;
+	    
 		// Generate a new Boundary string
 		$this->_setBoundary();
 
@@ -1318,7 +1328,7 @@ class SMTPs
 		die ("Sorry, no content");
 
 		// If we have ONE, we can use the simple format
-		else if( $keyCount === 1 )
+		else if( $keyCount === 1 && empty($conf->global->MAIN_MAIL_USE_MULTI_PART))
 		{
 			$_msgData = $this->_msgContent;
 			$_msgData = $_msgData[$_types[0]];
@@ -1336,7 +1346,7 @@ class SMTPs
 		}
 
 		// If we have more than ONE, we use the multi-part format
-		else if( $keyCount > 1 )
+		else if( $keyCount >= 1 || ! empty($conf->global->MAIN_MAIL_USE_MULTI_PART))
 		{
 			// Since this is an actual multi-part message
 			// We need to define a content message Boundary
@@ -1351,14 +1361,18 @@ class SMTPs
 			$content .= "\r\n";
 
 			$content .= "--" . $this->_getBoundary('mixed') . "\r\n";
-
-			if (key_exists('image', $this->_msgContent))
+			
+			if (key_exists('image', $this->_msgContent))     // If inline image found
 			{
 				$content.= 'Content-Type: multipart/alternative; boundary="'.$this->_getBoundary('alternative').'"' . "\r\n";
 				$content .= "\r\n";
 				$content .= "--" . $this->_getBoundary('alternative') . "\r\n";
 			}
 
+			
+			// $this->_msgContent must be sorted with key 'text' or 'html' first then 'image' then 'attachment'
+
+
 			// Loop through message content array
 			foreach ($this->_msgContent as $type => $_content )
 			{
@@ -1409,13 +1423,24 @@ class SMTPs
 					if (key_exists('image', $this->_msgContent))
 					{
 						$content.= "Content-Type: text/plain; charset=" . $this->getCharSet() . "\r\n";
-						$content.= "\r\n" . strip_tags($_content['data']) . "\r\n"; // Add plain text message
+						$content.= "\r\n" . ($_content['dataText']?$_content['dataText']:strip_tags($_content['data'])) . "\r\n"; // Add plain text message
 						$content.= "--" . $this->_getBoundary('alternative') . "\r\n";
 						$content.= 'Content-Type: multipart/related; boundary="' . $this->_getBoundary('related') . '"' . "\r\n";
 						$content.= "\r\n";
 						$content.= "--" . $this->_getBoundary('related') . "\r\n";
 					}
-
+					
+					if (! key_exists('image', $this->_msgContent) && $_content['dataText'] && ! empty($conf->global->MAIN_MAIL_USE_MULTI_PART))  // Add plain text message part before html part
+					{
+					    $content.= 'Content-Type: multipart/alternative; boundary="'.$this->_getBoundary('alternative').'"' . "\r\n";
+    					$content .= "\r\n";
+	       				$content .= "--" . $this->_getBoundary('alternative') . "\r\n";
+					
+	       				$content.= "Content-Type: text/plain; charset=" . $this->getCharSet() . "\r\n";
+	       				$content.= "\r\n". $_content['dataText'] . "\r\n";
+	       				$content.= "--" . $this->_getBoundary('alternative') . "\r\n";
+					}	       				
+	       				
 					$content .= 'Content-Type: ' . $_content['mimeType'] . '; '
 					//                             . 'charset="' . $this->getCharSet() . '"';
 					. 'charset=' . $this->getCharSet() . '';
@@ -1431,7 +1456,14 @@ class SMTPs
 					if ( $this->getMD5flag() )
 					$content .= 'Content-MD5: ' . $_content['md5'] . "\r\n";
 
-					$content .= "\r\n"	. $_content['data'] . "\r\n\r\n";
+					$content .= "\r\n"	. $_content['data'] . "\r\n";
+
+					if (! key_exists('image', $this->_msgContent) && $_content['dataText'] && ! empty($conf->global->MAIN_MAIL_USE_MULTI_PART))  // Add plain text message part after html part
+					{
+					    $content.= "--" . $this->_getBoundary('alternative') . "--". "\r\n";
+					}
+					
+					$content .= "\r\n";
 				}
 			}