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DNS config preventing mail delivery

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# 8  
Old 06-28-2015
I realise that I'm joining this thread very late but you say "mailx command is not working anymore, so the servers are not sending email alerts to administrators". So presumably your user community is still able to use email otherwise they would all be complaining? You are saying that emails to sysadmins aren't working because their domain address(es) are not being resolved?

If that is the case then you have two options:
  1. Get the sysadmins target domains also registered on the DNS system so they are also resolved, or,
  2. Insert the sysadmins email domains into the /etc/hosts file on all systems. You will need to enter the FQDN in there.

In generic Unix terms, OS's (and you didn't say which OS this is) will look in /etc/hosts for name resolution before resorting to DNS. Therefore, by inserting IP addresses in /etc/hosts you can catch it early and resolve the name within the system.

If I've still misunderstood the issue please explain further.
Last edited by rbatte1; 06-29-2015 at 06:30 AM.. Reason: Converted text numbered list to formatted numbered list with LIST=1 tags
# 9  
Old 07-02-2015
on the
Code:
/etc/hosts

of the servers, I have inserted
Code:
10.100.48.11    prep01.headquarter.tmm

as instructed by the DNS admin, but unfortunately if I run the
Code:
mailx

command in this server, I do not get mail from it
# 10  
Old 07-02-2015
I'm joining this thread even later than my learned friend hicksd8, so apologies for that.

Do you get any errors at all? I'm thinking of it failing to connect and leaving a dead.letter file, return e-mail to the sending account, mail stuck in the mail queue (use mailq to see this)

If it is all clear, then see if you can try sendmail -v target.user@domain.name
It will just sit at a prompt, but you can type some simple message and then a line just containing a full-stop . to end the text.

My sanitised session looks like this. I type the parts in green:-
Code:
$> sendmail -v robin@mydomain.somewhere
Hello from the unix server.
.
robin@mydomain.somewhere... Connecting to my-relay-01.internal.domain. via relay...
220-SMTP Relay
220 Warning: no name found in DNS for your host address
>>> EHLO my.unix.server.domain
250-unix.server.domain
250-SIZE 0
250-ETRN
250-ENHANCEDSTATUSCODES
250-DSN
250-VRFY
250-AUTH 
250 8BITMIME
>>> MAIL From:<ROBIN@my.unix.server.domain> SIZE=28
250 2.0.0 ROBIN@my.unix.server.domain OK
>>> RCPT To:<robin@mydomain.somewhere>
250 2.0.0 robin@mydomain.somewhere OK
>>> DATA
354 Ready for data
>>> .
250 2.0.0 Message received OK
robin@mydomain.somewhere... Sent (2.0.0 Message received OK)
Closing connection to my-relay-01.internal.domain.
>>> QUIT
221 2.0.0 unix.server.domain closing
$>

If you get a train of output like this and without errors, then you can be happy that the mail is leaving your unix server. You will then need to talk to whomever manages the mail relay server. There can be filtering in place to prevent spam generation and you may be getting caught in that. Some companies only allow mail from recognised systems.


I hope that this helps,
Robin
# 11  
Old 07-02-2015
Hi

this is what I get when I run the
Code:
sendmail

command:

Code:
sendmail -v fretagi@mydomain.com
Hello from the unix server.
.
/dead.letter... Saved message in /dead.letter

I am not sure what dead.letter means
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