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diff --git a/src/vmime/net/transport.hpp b/src/vmime/net/transport.hpp
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+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002-2013 Vincent Richard <[email protected]>
+//
+// 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_TRANSPORT_HPP_INCLUDED
+#define VMIME_NET_TRANSPORT_HPP_INCLUDED
+
+
+#include "vmime/config.hpp"
+
+
+#if VMIME_HAVE_MESSAGING_FEATURES
+
+
+#include "vmime/net/service.hpp"
+#include "vmime/utility/stream.hpp"
+
+#include "vmime/mailboxList.hpp"
+
+
+namespace vmime {
+
+class header;
+class headerField;
+class message;
+class mailbox;
+class mailboxList;
+
+namespace net {
+
+
+/** A transport service.
+  * Encapsulate protocols that can send messages.
+  */
+
+class VMIME_EXPORT transport : public service
+{
+protected:
+
+	transport(shared_ptr <session> sess, const serviceInfos& infos, shared_ptr <security::authenticator> auth);
+
+public:
+
+	/** Send a message over this transport service.
+	  * The default implementation simply generates the whole message into
+	  * a string buffer and "streams" it via a inputStreamStringAdapter.
+	  *
+	  * @param msg message to send
+	  * @param progress progress listener, or NULL if not used
+	  */
+	virtual void send(shared_ptr <vmime::message> msg, utility::progressListener* progress = NULL);
+
+	/** Send a message over this transport service.
+	  *
+	  * @param expeditor expeditor mailbox
+	  * @param recipients list of recipient mailboxes
+	  * @param is input stream providing message data (header + body)
+	  * @param size size of the message data
+	  * @param progress progress listener, or NULL if not used
+	  * @param sender envelope sender (if empty, expeditor will be used)
+	  */
+	virtual void send
+		(const mailbox& expeditor,
+		 const mailboxList& recipients,
+		 utility::inputStream& is,
+		 const size_t size,
+		 utility::progressListener* progress = NULL,
+		 const mailbox& sender = mailbox()) = 0;
+
+	/** Send a message over this transport service.
+	  * The default implementation simply generates the whole message into
+	  * a string buffer and "streams" it via a inputStreamStringAdapter.
+	  *
+	  * @param msg message to send
+	  * @param expeditor expeditor mailbox
+	  * @param recipients list of recipient mailboxes
+	  * @param progress progress listener, or NULL if not used
+	  * @param sender envelope sender (if empty, expeditor will be used)
+	  */
+	virtual void send
+		(shared_ptr <vmime::message> msg,
+		 const mailbox& expeditor,
+		 const mailboxList& recipients,
+		 utility::progressListener* progress = NULL,
+		 const mailbox& sender = mailbox());
+
+
+	Type getType() const;
+
+protected:
+
+	/** Called by processHeader().
+	  * Decides what to do with the specified header field.
+	  *
+	  * @return NULL if the header should be removed, a reference to a new headerField
+	  * if the field is to be replaced, or a reference to the same headerField
+	  * that was passed if the field should be left as is
+	  */
+	shared_ptr <headerField> processHeaderField(shared_ptr <headerField> field);
+
+	/** Prepares the header before transmitting the message.
+	  * Removes headers that should not be present (eg. "Bcc", "Return-Path"),
+	  * or adds missing headers that are required/recommended by the RFCs.
+	  * The header is modified inline.
+	  *
+	  * @param header headers to process
+	  */
+	void processHeader(shared_ptr <header> header);
+};
+
+
+} // net
+} // vmime
+
+
+#endif // VMIME_HAVE_MESSAGING_FEATURES
+
+#endif // VMIME_NET_TRANSPORT_HPP_INCLUDED