Weekend Learning: Configuring the Workflow Mailer for a Proxy Server

On Oracle EBS R12.1.3 you can follow the MOS document "How To Configure the Mailer to Connect To a Proxy Server" via article ID 2139133.1 and even if you do not plan on changing your configuration you may want to see what is required.  This article even has reference to the additional step required if you have moved on to R12.2 and want to do this!