diff -up evolution-data-server-3.12.11/camel/camel-vee-summary.c.camel-vfoler-message-delete-freeze evolution-data-server-3.12.11/camel/camel-vee-summary.c

--- evolution-data-server-3.12.11/camel/camel-vee-summary.c.camel-vfoler-message-delete-freeze	2014-03-24 10:07:52.000000000 +0100

+++ evolution-data-server-3.12.11/camel/camel-vee-summary.c	2015-09-07 15:02:12.699393738 +0200

@@ -256,9 +256,7 @@ vee_info_set_flags (CamelMessageInfo *mi

 		if (ignore_changes)

 			camel_vee_folder_ignore_next_changed_event (vf, camel_folder_summary_get_folder (rmi->summary));

-		camel_folder_freeze (camel_folder_summary_get_folder (rmi->summary));

 		res = camel_message_info_set_flags (rmi, flags, set);

-		camel_folder_thaw (camel_folder_summary_get_folder (rmi->summary));

 		if (res) {

 			/* update flags on itself too */