Data Domain: upgrade to DDOS 8.6 warning: non-SMTP command from dd hostname
Summary: After upgrading Data Domain OS to 8.6, the mail server began logging warning messages daily related to unexpected HTTP traffic coming from the Data Domain system.
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Symptoms
Jun 18 05:03:29 mail server mail.warning postfix/submission/smtpd[549032]:warning: non-SMTP command from dd hostname [x.x.x.x]: GET/HTTP/1.1
Cause
This behavior is introduced by a new health check feature in DDOS 8.6.x.
The Data Domain performs a port connectivity check against configured systems.
The check uses curl, which sends an HTTP GET/request.
When directed at an SMTP port, this appears as a non-SMTP command, triggering a Postfix warning.
Resolution
No action is required.
This is expected and benign behavior.
The warning can be safely ignored.
No functional impact to mail services or Data Domain operation.
Affected Products
Data DomainArticle Properties
Article Number: 000482074
Article Type: Solution
Last Modified: 29 يونيو 2026
Version: 1
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