diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.0)
-set(PIM_VERSION "5.6.41")
+set(PIM_VERSION "5.6.42")
 
 project(KMime VERSION ${PIM_VERSION})
 
diff --git a/src/kmime_headers.h b/src/kmime_headers.h
--- a/src/kmime_headers.h
+++ b/src/kmime_headers.h
@@ -514,6 +514,11 @@
     void clear() override;
     bool isEmpty() const override;
 
+    /**
+      Initialize this identifier Copy the data from
+     */
+    void fromIdent(const Ident* ident);
+
     /**
       Returns the list of identifiers contained in this header.
       Note:
diff --git a/src/kmime_headers.cpp b/src/kmime_headers.cpp
--- a/src/kmime_headers.cpp
+++ b/src/kmime_headers.cpp
@@ -996,6 +996,13 @@
     return rv;
 }
 
+void Ident::fromIdent(const Ident* ident)
+{
+    d_func()->encCS = ident->d_func()->encCS;
+    d_func()->msgIdList = ident->d_func()->msgIdList;
+    d_func()->cachedIdentifier = ident->d_func()->cachedIdentifier;
+}
+
 void Ident::appendIdentifier(const QByteArray &id)
 {
     Q_D(Ident);