Fixed attachment detection with non-MIME message (thanks to Peter Libic).

src/attachmentHelper.cpp

@@ -72,6 +72,12 @@ const bool attachmentHelper::isBodyPartAnAttachment(ref <const bodyPart> part)
 		}
 		catch (exceptions::no_such_field&)
 		{
+			// If this is the root part and no Content-Type field is present,
+			// then this may not be a MIME message, so do not assume it is
+			// an attachment
+			if (part->getParentPart() == NULL)
+				return false;
+
 			// No "Content-type" field: assume "application/octet-stream".
 			type = mediaType(mediaTypes::APPLICATION,
 			                 mediaTypes::APPLICATION_OCTET_STREAM);