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

Last updated on JULY 05, 2023

Applies to:

PL/SQL - Version and later
Information in this document applies to any platform.


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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In this Document
Troubleshooting Steps

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