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mailx for red hat version 5.4

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# 8  
Old 01-11-2011
I've got the following in my /var/log/maillog

Code:
Jan 11 12:56:41 hostname sendmail[20855]: p0B5SNNm023940: to=<user@hostname.doamin>, ctladdr=<user@localhost.localdomain> (502/501), delay=06:28:18, xdelay=00:00:00, mailer=esmtp, pri=750423, relay=hostname.domainname., dsn=4.0.0, stat=Deferred: Name server: hostname.domainname.: host name lookup failure

# 9  
Old 01-11-2011
Is this a new installation which does not work, or is the problem confined to certain email addresses?

Assuming that your sendmail has been configured to allow external mail and is basically working, certain ISPs will attempt a reverse DNS lookup of your server and ignore you if the lookup fails. You may need a "DM" record for a valid external domain in /etc/mail/sendmail.cf for example.

What is in /etc/resolv.conf ?
Does "nslookup" (or "dig") work for external addresses?

Does "mailq" command show items still queued ?
# 10  
Old 01-12-2011
It is a new Installation.

Code:
/etc/resolv.conf

Code:
----------------------
#nameserver <ip_address>
#nameserver <ip_address>
#nameserver <ip_address>
#nameserver <ip_address>
nameserver <mymail_ipaddress>
options attempts:5
options timeout:15
 
 
$ nslookup <mymail_ip_address>
;; connection timed out; no servers could be reached
 
$ dig <mymail_ip_address>
 
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> <mymail_ip_address>
;; global options:  printcmd
;; connection timed out; no servers could be reached

# 11  
Old 01-12-2011
Quote:
#nameserver <ip_address>
#nameserver <ip_address>
#nameserver <ip_address>
#nameserver <ip_address>
nameserver <mymail_ipaddress>
options attempts:5
options timeout:15
It would appear that whatever is at <mymail_ipaddress> is not a nameserver. It can't even look it's own name up. In fact, what is it and where is it?
I assume that the "<" and ">" character are not in the record and that the line looks roughly like this:
Code:
nameserver 10.10.10.10

What is in this file:
Code:
/etc/mail/service.switch

Let's get some more context.
Is this one computer of many on a corporate network or say a single home computer? You can often read the settings values from another working computer or if it is a single home computer get the settings from advice on your ISP's website.
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