SUMMARY: Sendmail Problems...

From: Andre M. Coleman (no email)
Date: Tue Jan 20 1998 - 13:12:55 CST


Greetings Sun Managers,

I have recently upgraded my Sparc 2 server from Solaris 2.4
to Solaris 2.5.1 (with all the recommended patches).
Everything appears to be working correctly with the exception
of the outgoing mail services. Anytime a user sends mail
to the outside world, it is bounced back w/ a message
regarding the host not being found:

   ----- The following addresses had delivery problems -----
<> (unrecoverable error)

   ----- Transcript of session follows -----
550 <>... Host unknown (Name server: host not found)

Running sendmail from the command line results in:

ROOT> /usr/lib/sendmail -qv
<>... Host unknown (Name server:
host not found)

I am imagining that I do not have something set up correctly in
the file, however, I cannot figure what.

Any help on this matter would be greatly appreciated.

I will summarize.

Andre Coleman (
GEO/Graphics, Inc.

My thanks and gratitude to the following people:

Shriman Gurung <>
David Wolfskill <>
Marcos Assis Silva <>
Jim Harmon <>
Karl E. Vogel <>
Alessandro Forghieri <>
Bismark Espinoza <bismark@alta.Jpl.Nasa.Gov>
Joseph S D Yao <>

This actually turned out to be a simple fix:

For one reason or another, my /etc/nsswitch.conf file was missing
the 'dns' entry for hosts, and therefore was not able to do any
DNS lookups.

Andre Coleman (
GEO/Graphics, Inc.

This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:12:29 CDT