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Full Discussion: [Solved] mailx : unknown user issue
Operating Systems HP-UX [Solved] mailx : unknown user issue Post 302663095 by methyl on Wednesday 27th of June 2012 02:44:31 PM
Old 06-27-2012
Make sure that the SMTP relay server itself knows about you and can do a reverse DNS lookup on your IP address.


Quote:
nslookup output:

looking up FILES
Name: smtphostname
Address: xx.xxx.xx.43
The SMTP relay name would normally be a fully qualified host name such that the line reads something like:
Code:
DS smtphostname.domain.com

And the entry (or alias) in /etc/hosts should be the fully qualified host name.


Quote:
there are many server names which are non-commented in /etc/mail/sendmail.cw
I'd only expect localhost and the fully qualified name of the local server unless you are the mail relay server yourself. If the SMTP mail relay server is in the list, that might explain it.

What else? Make sure that nobody has deleted the localhost entry in /etc/hosts and check the system mail log for error messages.
Quick check of the SMTP relay server with telnet to port 25 to make sure that it is listening.
This User Gave Thanks to methyl For This Post:
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LEARN ABOUT CENTOS

pam_issue

PAM_ISSUE(8)							 Linux-PAM Manual						      PAM_ISSUE(8)

NAME

       pam_issue - PAM module to add issue file to user prompt

SYNOPSIS

       pam_issue.so [noesc] [issue=issue-file-name]

DESCRIPTION

       pam_issue is a PAM module to prepend an issue file to the username prompt. It also by default parses escape codes in the issue file similar
       to some common getty's (using x format).

       Recognized escapes:

       d
	   current day

       l
	   name of this tty

       m
	   machine architecture (uname -m)

       

	   machine's network node hostname (uname -n)

       o
	   domain name of this system

       
	   release number of operating system (uname -r)

       	
	   current time

       s
	   operating system name (uname -s)

       u
	   number of users currently logged in

       U
	   same as u except it is suffixed with "user" or "users" (eg. "1 user" or "10 users")

       v
	   operating system version and build date (uname -v)

OPTIONS

       noesc
	   Turns off escape code parsing.

       issue=issue-file-name
	   The file to output if not using the default.

MODULE TYPES PROVIDED

       Only the auth module type is provided.

RETURN VALUES

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_IGNORE
	   The prompt was already changed.

       PAM_SERVICE_ERR
	   A service module error occurred.

       PAM_SUCCESS
	   The new prompt was set successfully.

EXAMPLES

       Add the following line to /etc/pam.d/login to set the user specific issue at login:

		   auth optional pam_issue.so issue=/etc/issue

SEE ALSO

       pam.conf(5), pam.d(5), pam(8)

AUTHOR

       pam_issue was written by Ben Collins <bcollins@debian.org>.

Linux-PAM Manual						    09/19/2013							      PAM_ISSUE(8)
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