diff --git a/head/offlineimap/folder/Base.py b/head/offlineimap/folder/Base.py
index abc26fc..b092fa6 100644
--- a/head/offlineimap/folder/Base.py
+++ b/head/offlineimap/folder/Base.py
@@ -97,6 +97,10 @@ class BaseFolder:
         newflags.sort()
         self.savemessageflags(uid, newflags)
 
+    def addmessagesflags(self, uidlist, flags):
+        for uid in uidlist:
+            self.addmessageflags(uid)
+
     def deletemessageflags(self, uid, flags):
         """Removes each flag given from the message's flag set.  If a given
         flag is already removed, no action will be taken for that flag."""
@@ -174,13 +178,16 @@ class BaseFolder:
 
         Look for message present in dest but not in self.
         If any, delete them."""
+        deletelist = []
         for uid in dest.getmessagelist().keys():
             if uid < 0:
                 continue
             if not uid in self.getmessagelist():
-                __main__.ui.deletingmessage(uid, applyto)
-                for object in applyto:
-                    object.deletemessage(uid)
+                deletelist.append(uid)
+        if len(deletelist):
+            __main__.ui.deletingmessages(uidlist, applyto)
+            for object in applyto:
+                object.deletemessages(uidlist)
 
     def syncmessagesto_flags(self, dest, applyto):
         """Pass 4 of folder synchronization.
diff --git a/head/offlineimap/folder/IMAP.py b/head/offlineimap/folder/IMAP.py
index 6d3d7e5..9b110d0 100644
--- a/head/offlineimap/folder/IMAP.py
+++ b/head/offlineimap/folder/IMAP.py
@@ -102,12 +102,32 @@ class IMAPFolder(BaseFolder):
         flags = imaputil.flags2hash(imaputil.imapsplit(result)[1])['FLAGS']
         self.messagelist[uid]['flags'] = imaputil.flagsimap2maildir(flags)
 
+    def addmessagesflags(self, uidlist, flags):
+        assert(self.imapobj.select(self.getfullname())[0] == 'OK')
+        r = self.imapobj.uid('store',
+                             ','.join([str(uid) for uid in uidlist]),
+                             '+FLAGS',
+                             imaputil.flagsmaildir2imap(flags))[1]
+        resultcount = 0
+        for result in r:
+            resultcount += 1
+            flags = imaputil.flags2hash(imaputil.imapsplit(result)[1])['FLAGS']
+            self.messagelist[uid]['flags'] = imaputil.flagsimap2maildir(flags)
+        assert resultcount == len(uidlist), "Got incorrect number of results back"
+
     def deletemessage(self, uid):
-        if not uid in self.messagelist:
-            return
-        self.addmessageflags(uid, ['T'])
+        self.deletemessages([uid])
+
+    def deletemessage(self, uidlist):
+        # Weed out ones not in self.messagelist
+        uidlist = [uid for uid in uidlist if uid in self.messagelist]
+        if not len(uidlist):
+            return        
+        
+        self.addmessagesflags(uidlist, ['T'])
         assert(self.imapobj.select(self.getfullname())[0] == 'OK')
         assert(self.imapobj.expunge()[0] == 'OK')
-        del(self.messagelist[uid])
+        for uid in uidlist:
+            del(self.messagelist[uid])
         
         
diff --git a/head/offlineimap/ui/UIBase.py b/head/offlineimap/ui/UIBase.py
index 88f9a95..cf56a59 100644
--- a/head/offlineimap/ui/UIBase.py
+++ b/head/offlineimap/ui/UIBase.py
@@ -91,6 +91,13 @@ class UIBase:
         ds = s.folderlist(destlist)
         s._msg("Deleting message %d in %s" % (uid, ds))
 
+    def deletingmessages(s, uidlist, destlist):
+        ds = s.folderlist(destlist)
+        s._msg("Deleting %d messages (%s) in %s" % \
+               (len(uidlist),
+                ", ".join([str(u) for u in uidlist]),
+                ds))
+
     def addingflags(s, uid, flags, destlist):
         ds = s.folderlist(destlist)
         s._msg("Adding flags %s to message %d on %s" % \