R12.1.3 Workflow: Notification preferences are being set to DISABLED

The My Oracle Support article ID 1588209.1 for "Notification Preference Gets Set To DISABLED" appears to be from 2012 or 2013, but appears to still be relevant as there are several patches which need to be applied AND you can find a pattern in the Notification Mailer log files which can be monitored for!

R12 Workflow: Automated replies give "Client was not authenticated" errors

On R12.1.3 and R12.1 "Automatic Reply To Unsolicited Mail shows erros 530 5.7.1 Client was not authenticated" from MOS document ID 1991613.1 indicates this can be resolved with a patch but it seems like the root cause is when the SMTP server gets changed!

R12: How to configure Workflow Notification Mailer to use Cloud servers

If you are on EBS R12 you probably need to look at the "Configuring an Oracle Workflow Notification Mailer with Cloud E-Mail Servers" document 2077434.1 on MOS to find out how you take your application to the next level!