diff --git a/server/mailserver/mail/mailmgr.go b/server/mailserver/mail/mailmgr.go
index c32250e1..1f69d655 100644
--- a/server/mailserver/mail/mailmgr.go
+++ b/server/mailserver/mail/mailmgr.go
@@ -19,7 +19,7 @@ type dbEvent struct {
 
 type userGroup struct {
 	groupId int64
-	userHash sync.Map
+	userHash *sync.Map
 }
 
 type mailMgr struct {
@@ -89,7 +89,7 @@ func (this *mailMgr) loadGroups() {
 			if this.getGroup(groupId) != nil {
 				panic(fmt.Sprintf("mailMgr.loadGroups group_id error"))
 			}
-			p := new(userGroup)
+			p := newUserGroup()
 			p.groupId = groupId
 			this.addGroup(p)
 		},
@@ -456,7 +456,18 @@ func (this* mailMgr) procGroupUpdate(e *dbEvent) {
 				if err != nil {
 					return
 				}
+				groupId := q5.ToInt64(ds.GetByName("group_id"))
+				g :=  this.getGroup(groupId)
+				if g == nil {
+					p := newUserGroup()
+					p.groupId = groupId
+					this.addGroup(g)
+				} else {
+					g.userHash = new(sync.Map)
+				}
 				if ds.Next() {
+					memberId := ds.GetByName("member_id")
+					g.userHash.Store(memberId, q5.ToInt64(ds.GetByName("idx")))
 					return
 				} else {
 					panic(fmt.Sprintf("procGroupUpdate1 error:%s", err));
@@ -489,3 +500,9 @@ func (this* mailMgr) procGroupUpdate(e *dbEvent) {
 			}
 		})
 }
+
+func newUserGroup() *userGroup {
+	g := new(userGroup)
+	g.userHash = new(sync.Map)
+	return g
+}