Added deletion of non-standard headers.

include/mailio/message.hpp

@@ -435,14 +435,25 @@ class MAILIO_EXPORT message : public mime
     void attachment(std::size_t index, std::ostream& att_strm, std::string& att_name) const;
 
     /**
-    Adding another header. Adding a header defined by other methods leads to the undefined behaviour.
+    Adding another header.
+
+    Adding a header defined by other methods leads to the undefined behaviour.
 
     @param name  Header name.
     @param value Header value.
-    @todo        Disallowing already defined headers?
+    @todo        Disallowing standard headers defined elsewhere?
     **/
     void add_header(const std::string& name, const std::string& value);
 
+    /**
+    Removing another header.
+
+    Removing a header defined by other methods leads to the undefined behaviour.
+
+    @param name Header to remove.
+    **/
+    void remove_header(const std::string& name);
+
     /**
     Returning the other headers.
 

src/message.cpp

@@ -490,6 +490,12 @@ void message::add_header(const string& name, const string& value)
 }
 
 
+void message::remove_header(const std::string& name)
+{
+    _headers.erase(name);
+}
+
+
 multimap<string, string> message::headers() const
 {
     return _headers;