Host name lookup failure.

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Operating Systems Solaris Host name lookup failure.
# 1  
Old 08-03-2009
Host name lookup failure.

Hi Gurus

I am getting the following message continuosly in my /var/adm/messages file:

Aug 3 13:31:21 mumux102 sendmail[19290]: [ID 801593] n6UHxxTm019703: to=postmaster, delay=3+14:00:01, xdelay=00:00:00, mailer=relay, pri=30730707,, dsn=4.0.0, stat=Deferred: Name server: host name lookup failure

I find that ping to name server mentioned above is working fine.

[!]root: ping is alive

Any idea what is causing this and how i can avoid this.

# 2  
Old 08-03-2009
what it says?

run mailq command to see if there are many mails stuck in the queue.
# 3  
Old 08-05-2009

The mailq command output:

[!]root: mailq
/var/spool/mqueue is empty
Total requests: 0


---------- Post updated at 10:48 AM ---------- Previous update was at 10:46 AM ----------


nslookup output:

[!]root: nslookup
Non-authoritative answer:
# 4  
Old 08-07-2009
can try telnet 25

basically it is just checking whether port 25 of is open to your server.

if you get connection closed means port 25 service not started on fisborelay or some filtering like firewall blocked it.
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