I'm about to apply a huge patch (12.1.1 patch) which will take at least 12 hrs. When I was testing this before I answered the question regarding email notification as "Yes" and specified my email address, but for some reason adpatch did not send the email when a worker failed.
How can I investigate the root cause of this issue? Where is adpatch reading the SMTP server information from?
You need to setup the email from the OS -- Perform SMTP telnet test as per (How to Perform a Meaningful SMTP Telnet Test to Troubleshoot Java Mailer For Sending Email Notifications [ID 753845.1]). If you can send an email from the OS, you should be able to receive emails from adpatch session.