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DNS config preventing mail delivery

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# 1  
Old 06-18-2015
DNS config preventing mail delivery
Hi

Please can you help on this: the Net Admins decided to use DNS to resolve names, so this is preventing mail being delivered when using commands like
Code:
date | mailx -s "test" abc.xyz@asdf.xx.yy

.
What we were asked was to edit
Code:
/etc/resolv.conf

and add 3 entries, in all servers
# 2  
Old 06-18-2015
Normally a network admin task, however not a terribly complex one...
simply add a nameserver entry for the DNS hosts in use (or a search pragma for local domains )
eg.
Code:
search asdf.xx.yy xx.yy
nameserver 10.0.0.59
nameserver 192.168.1.59

or you can indicate a local domain by setting the env variable LOCALDAOMAIN, eg...
Code:
export LOCALDOMAIN="$LOCALDOMAIN asdf.xx.yy"

# 3  
Old 06-18-2015
May be I did not express myself correctly. what is happening is ever since the net Admin decided to use DNS to resolve names, the
Code:
mailx

command is not working anymore, so the servers are not sending email alerts to administrators
# 4  
Old 06-18-2015
You are absolutely right, you did not express yourself correctly. Even after the second attempt, I'm not sure what you want/need.
When net admins decide to modify essential services, they also should take care of the ramifications, i.e. set up the entire system / domain so it works correctly after their m...aintenance. But even if they introduced DNS, you still could use the hosts (i.e. files) name resolution option. Or, just for test purposes, you could mail to the user@numericalIP.
# 5  
Old 06-18-2015
Ok, before I was asked to edit
Code:
/etc/resolv.conf

and add some entries, I was able to use the
Code:
mailx

command from any server to send email from servers to myself and other people. But now I am not able to send emails from any server
# 6  
Old 06-18-2015
So your MTP (probably sendmail if you don't know which transfer program your using) cannot resolve the asdf.xx.yy domain.
Can you do the following
Code:
telnet asdf.xx.yy 25
ehlo
MAIL FROM:<fretagi@this.host>
RCPT TO:<abc.xyz@asdf.xx.yy>
DATA

This is a test mail, did I get it.
.
quit

If not, at what point does it fail?
# 7  
Old 06-18-2015
this is it:
Code:
? mail from: fretagi@this.host
Subject: test
rcpt to : abc.xyz@asdf.xx.yy
test3, test 4
.
EOT
? from:... List:; syntax illegal for recipient addresses
/dead.letter... Saved message in /dead.letter
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