Deprecated Senders and Receivers

In SDL Tridion 2011 Senders have a new Java class and Receivers are no longer used. SDL recommends to update your Transport Service configuration file on the Content Manager. Also, if you use custom Senders and Receivers, you must update your code.

Senders
Senders no longer extend the com.tridion.transport.Sender class, but instead implement the com.tridion.transport.connection.TransportConnector interface.
For default Senders, this means that an XSLT stylesheet automatically changes the Class attributes of the default Senders in your existing cd_transport_conf.xml to reflect the change. SDL recommends that you edit the Class attribute by hand to point to the new classes.
As far as your own custom Senders are concerned, you must reimplement such a Sender, so that it no longer extends com.tridion.transport.Sender, but instead implements com.tridion.transport.connection.TransportConnector.
Receivers
Receivers no longer exist. Your custom Receiver can no longer be configured in the Content Deployer configuration file, cd_deployer_conf.xml.
Content Delivery automatically transforms your existing Content Deployer configuration (which contained Receivers) into a new one. You can also update your configuration file yourself by hand by applying the XSLT. The documentation topics about upgrading Content Delivery explain how.