Technical Tip: How to disable 'SMTP Auth Failure' log
Description
This article describes how to disable the 'SMTP Auth Failure' log message.
Scope
FortiMail.
Solution
- Make sure to configure the SMTP authentication setting properly.
- In some situations, there is no SMTP authentication setting.
Notice that a lot of 'SMTP Auth Failure' log messages in FortiMail can appear under Monitor -> Log -> History as below.
- To avoid FortiMail from stopping logging 'SMTP Auth Failure' log message as there is no SMTP Authentication setting, consider running the CLI commands in FortiMail as below.
config sys mailserver
set smtp-auth disable
set smtp-auth-over-tls disable
set smtp-auth-smtps disable
end
set smtp-auth-over-tls disable
set smtp-auth-smtps disable
end
In the GUI:
 
Note: If an external third-party application relies on any of the specified authentication services to relay through FortiMail, the service cannot be disabled.