diff -r fdc075324ef3 -r 03cc47e9daee src/org/sonews/storage/DrupalMessage.java
--- a/src/org/sonews/storage/DrupalMessage.java	Tue Oct 25 10:39:57 2011 +0200
+++ b/src/org/sonews/storage/DrupalMessage.java	Tue Oct 25 14:10:55 2011 +0200
@@ -30,10 +30,13 @@
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Date;
 import java.util.Enumeration;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import javax.mail.Header;
 import javax.mail.MessagingException;
 import javax.mail.Multipart;
@@ -161,14 +164,26 @@
 		super(Session.getDefaultInstance(System.getProperties()), serializeArticle(article));
 		initFactories();
 
-		String[] parentHeaders = getHeader("In-Reply-To");
-		if (parentHeaders != null && parentHeaders.length == 1) {
-			String parentMessageID = parentHeaders[0];
-			parentID = parseArticleID(parentMessageID);
-			groupID = parseGroupID(parentMessageID);
+		String[] replyToHeaders = getHeader("In-Reply-To");
+		String[] referencesHeaders = getHeader("References");
+		String parentMessageID;
+		if (replyToHeaders != null && replyToHeaders.length == 1) {
+			parentMessageID = replyToHeaders[0];
+		} else if (referencesHeaders != null && referencesHeaders.length == 1) {
+			Pattern p = Pattern.compile("(\\s*<.*>)*\\s*(<.*>)");
+			Matcher m = p.matcher(referencesHeaders[0]);
+
+			if (m.matches()) {
+				parentMessageID = m.group(2);
+			} else {
+				throw new MessagingException("Message posted by user had invalid References header: " + referencesHeaders[0]);
+			}
 		} else {
-			throw new MessagingException("Message posted by user must have exactly one In-Reply-To header.");
+			throw new MessagingException("Message posted by user must have exactly one In-Reply-To header. Reply-To headers: " + Arrays.toString(replyToHeaders) + " Referemces headers: " + Arrays.toString(referencesHeaders));
 		}
+
+		parentID = parseArticleID(parentMessageID);
+		groupID = parseGroupID(parentMessageID);
 	}
 
 	private static InputStream serializeArticle(Article a) {
@@ -503,7 +518,7 @@
 			throw new StorageBackendException(e);
 		}
 	}
-	
+
 	public String getBodyPlainText() throws StorageBackendException {
 		/**
 		 * TODO: netransformovat XHTML 2x