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Full Discussion: Sendmail Fails to send emails from Linux server.
Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303003129 by drysdalk on Thursday 7th of September 2017 07:19:55 PM
Old 09-07-2017
Hi,

OK, I’m starting to run out of ideas off the top of my head, but we’re not totally done yet. One further possibility: does your system believe that it is in fact smtp.techx.com or techx.com? That’s one remaining possible explanation here.

So, some commands it might be useful to see the output of now include:

Code:
hostname 
grep -i techx /etc/hosts
grep hosts: /etc/nsswitch.conf
cat /etc/mail/service.switch

That last one might not exist, but it might - if it does, it would be interesting to see the contents, and it might well be our culprit.

Basically, at this point we’re now attempting to determine if your system believes it is in fact techx.com purely on the basis of hosts file entries, and also we want to see exactly how your system is configured to resolve hostnames when it encounters them.

Beyond that, I’m not sure what else to suggest. I’ve never known a smart relay entry to fail to work. Either something more fundamental is over-riding the behaviour of Sendmail, or it believes that it is in fact smtp.techx.com, and so is actually behaving correctly, so to speak.

EDIT: One last thing. What IP does your system resolve smtp.techx.com and techx.com to be, and are they in fact the same IP as your system ?
 

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LEARN ABOUT OPENSOLARIS

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

       domainname(1M), sendmail(1M), hosts(4), attributes(5)

SunOS 5.11							    8 Mar 2006							check-hostname(1M)
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