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Sendmail is unable to qualify my own domain name (Doc ID 1011800.1)

Last updated on JANUARY 02, 2018

Applies to:

Solaris Operating System - Version 8 6/00 U1 to 11.1 [Release 8.0 to 11.0]
All Platforms

Symptoms

The following error message:

Apr 13 18:13:57 hostname sendmail[315]: unable to qualify my own domain name (hostname.) -- using short name



or the message:

Cannot qualify own hostname.

Changes

This most typically seen after a new installation of Oracle Solaris.  In the file /etc/nsswitch.conf the "files" source was being used first for hostname lookups:

hosts: files nis dns

Cause

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