Random/Sporadic/Intermittent "ORA-29278: SMTP transient error: 421 Service not available" Errors (Doc ID 1435323.1)

Purpose

There are a number of Documents available to address the "ORA-29278: SMTP transient error: 421 Service not available" error when it occurs on demand or every time the code is executed.

This Document is written to address those scenarios is which issues are random, sporadic, or intermittent. This Note is not going to provide solutions as the majority of the issues are non-Oracle related. These types of issues usually result in a Network timeout issue, a firewall issue, or even a mail server issue configuration issue.  Instead, this Document will provide recommendations on where to look and what traces to collect.

Troubleshooting Steps

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