diff -urN pristine/src/messageBuilder.cpp libvmime-0.7.1/src/messageBuilder.cpp
--- pristine/src/messageBuilder.cpp	2005-03-18 22:26:47.000000000 +0100
+++ libvmime-0.7.1/src/messageBuilder.cpp	2006-01-13 09:49:51.000000000 +0100
@@ -50,14 +50,11 @@
 	// Generate the header fields
 	msg->getHeader()->Subject().setValue(m_subject);
 
-	if (m_from.isEmpty())
-		throw exceptions::no_expeditor();
-
-	if (m_to.isEmpty() || m_to.getAddressAt(0)->isEmpty())
-		throw exceptions::no_recipient();
-
-	msg->getHeader()->From().setValue(m_from);
-	msg->getHeader()->To().setValue(m_to);
+	if (!m_from.isEmpty())
+		msg->getHeader()->From().setValue(m_from);
+		
+	if (!m_to.isEmpty())
+		msg->getHeader()->To().setValue(m_to);
 
 	if (!m_cc.isEmpty())
 		msg->getHeader()->Cc().setValue(m_cc);