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diff --git a/vmime-master/src/vmime/net/dsnAttributes.hpp b/vmime-master/src/vmime/net/dsnAttributes.hpp
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+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2020 Jan Osusky <jan@osusky.name>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 3 of
+// the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library.  Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#ifndef VMIME_NET_DSNATTRIBUTES_HPP_INCLUDED
+#define VMIME_NET_DSNATTRIBUTES_HPP_INCLUDED
+
+
+#include "vmime/config.hpp"
+
+
+#if VMIME_HAVE_MESSAGING_FEATURES
+
+
+#include <vector>
+
+#include "vmime/types.hpp"
+
+
+namespace vmime {
+namespace net {
+
+
+/** Holds a set of attributes for Delivery Status Notifications (DSN).
+  */
+class VMIME_EXPORT dsnAttributes : public object {
+
+public:
+
+	/** Constructs an empty dsnAttributes object.
+	  */
+	dsnAttributes() = default;
+
+	/** Constructs a new dsnAttributes object by copying an existing object.
+	  *
+	  * @param dsn object to copy
+	  */
+	dsnAttributes(const dsnAttributes& dsn) = default;
+
+	/** Constructs a new dsnAttributes object by moving an existing object.
+	  *
+	  * @param dsn object (Rvalue reference) to move from.
+	  */
+	dsnAttributes(dsnAttributes&& dsn) = default;
+
+	~dsnAttributes() = default;
+
+	/** Constructs a new dsnAttributes object by specifying the attributes.
+	  *
+	  * @param dsnNotify comma separated list of notification conditions as specified in RFC 1891
+	  * @param dsnRet content of DSN - full message or headers only ("FULL" or "HDRS")
+	  * @param dsnEnvelopId envelop ID to be able to pair the DSN with original message (plain text not in "<" ">")
+	  */
+	dsnAttributes(const string& dsnNotify, const string& dsnRet, const string& dsnEnvelopId);
+
+	/** Returns comma separated list of notification conditions as specified in RFC 1891
+	  *
+	  * @return comma separated list of notification conditions as specified in RFC 1891
+	  */
+	string getNotificationConditions() const;
+
+	/** Returns requested format of the notification (RET parameter of the ESMTP MAIL command).
+	  *
+	  * @return requested format of the notification.
+	  */
+	string getReturnFormat() const;
+
+	/** Returns envelop ID used to pair the DSN with the original message.
+	  *
+	  * @return envelop ID used to pair the DSN with the original message.
+	  */
+	string getEnvelopId() const;
+
+	/** Returns whether the object is empty, and no attribute has been set.
+	  *
+	  * @return true if object is empty, or false otherwise
+	  */
+	bool isEmpty() const;
+
+private:
+
+	string m_notifications;
+	string m_returnFormat;
+	string m_envelopId;
+};
+
+
+} // net
+} // vmime
+
+
+#endif // VMIME_HAVE_MESSAGING_FEATURES
+
+
+#endif // VMIME_NET_DSNATTRIBUTES_HPP_INCLUDED