Index: t3lib/class.t3lib_htmlmail.php
===================================================================
--- t3lib/class.t3lib_htmlmail.php	(revision 3633)
+++ t3lib/class.t3lib_htmlmail.php	(working copy)
@@ -476,7 +476,7 @@
 
 			// From
 		if ($this->from_email) {
-			if ($this->from_name) {
+			if ($this->from_name && TYPO3_OS!='WIN') {
 				$this->add_header('From: '.$this->from_name.' <'.$this->from_email.'>');
 			} else {
 				$this->add_header('From: '.$this->from_email);
@@ -484,7 +484,7 @@
 		}
 			// Reply
 		if ($this->replyto_email) {
-			if ($this->replyto_name) {
+			if ($this->replyto_name && TYPO3_OS!='WIN') {
 				$this->add_header('Reply-To: '.$this->replyto_name.' <'.$this->replyto_email.'>');
 			} else {
 				$this->add_header('Reply-To: '.$this->replyto_email);