07-17-2008
You're not giving a FQDN for your machine in /etc/hosts, so sendmail will keep trying to find its name (domain name in /etc/resolv.conf). If that's not configured correctly it will fail (because there is no something.yahoo.com or other).
Instead put the FQDN in /etc/hosts directly:
10.3.2.7 something something.yahoo.com loghost
and then it won't matter what domain/search entry is in /etc/resolv.conf.
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LEARN ABOUT SUNOS
check-hostname
check-hostname(1M) System Administration Commands check-hostname(1M)
NAME
check-hostname - check if sendmail can determine the system's fully-qualified host name
SYNOPSIS
/usr/sbin/check-hostname
DESCRIPTION
The check-hostname script is a migration aid for sendmail(1M). This script tries to determine the local host's fully-qualified host name
(FQHN) in a manner similar to sendmail(1M). If check-hostname is able to determine the FQHN of the local host, it reports success. Other-
wise, check-hostname reports how to reconfigure the system so that the FQHN can be properly determined.
FILES
/etc/hosts Host name database
/etc/nsswitch.conf Name service switch configuration file
/etc/resolv.conf Configuration file for name server routines
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWsndmu |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO
sendmail(1M), hosts(4), attributes(5)
SunOS 5.10 10 Nov 2003 check-hostname(1M)