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SMTP Server 550 5.1.1 User unknown Error

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Operating Systems Solaris SMTP Server 550 5.1.1 User unknown Error
# 1  
Old 12-30-2013
Blade SMTP Server 550 5.1.1 User unknown Error
Hello All,

I am currently running a Solaris 10 machine as inbound SMTP server i.e. bringing Emails from outside into our company. In /var/spool/mqueue , I have mails that are pending for the past 4-5 days. They are not being delivered and are causing my mount point size to increase.

Error type is:

Code:
Final-Recipient: RFC822; xyz@my-domain.com
Action: failed
Status: 5.1.1
Remote-MTA: DNS; [172.21.8.35]
Diagnostic-Code: SMTP; 550 5.1.1 User unknown
Last-Attempt-Date: Sun, 29 Dec 2013 23:02:21 +0500 (PKT)

Let me state that this is only occurring for Email IDs that DO NOT exist in our domain. Emails IDs that have been wrongly typed or so.

Is there some sendmail configuration that I can do that can DISCARD such Emails and not pile up in my /var/spool/mqueue.

Help.
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LEARN ABOUT DEBIAN

snnewgroup

snnewgroup.v0.3.8(8)					      System Manager's Manual					      snnewgroup.v0.3.8(8)

NAME

       snnewgroup - create a new sn newsgroup

SYNOPSIS

       snnewgroup newsgroup [server] [port]

DESCRIPTION

       snnewgroup creates newsgroup assigning it an upstream NNTP server of server:port.  If port is not specified, defaults to 119.  If server is
       also not specified, newsgroup is created as a local group which is fed only by articles POSTed to it.

       You will need to be root or own /var/spool/sn in order to add new groups.

ENVIRONMENT VARIABLES

       SNROOT If this is set and is not empty, the value is used in place of /var/spool/sn, the default news spool directory.

FILES CREATED

       /var/spool/sn/newsgroup
	      Directory where articles will be stored.

       /var/spool/sn/newsgroup/.created
	      Empty file for the newsgroup creation time.

       /var/spool/sn/newsgroup/.serial
	      Where snget gets its idea of the new starting serial number for newsgroup on server server:port.	The value is initialized to 0.

       /var/spool/sn/newsgroup/.outgoing
	      If server is specified, is a symlink to  /var/spool/sn/.outgoing/server:port, which is a directory, created if it does  not  already
	      exist.  If server is not specified, no file /var/spool/sn/newsgroup/.outgoing will be created.  See also snsend.

SEE ALSO

       sndelgroup, snsend

N.B.								    Harold Tay						      snnewgroup.v0.3.8(8)