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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

net::sslglue::smtp

Net::SSLGlue::SMTP(3pm) 				User Contributed Perl Documentation				   Net::SSLGlue::SMTP(3pm)

NAME

       Net::SSLGlue::SMTP - make Net::SMTP able to use SSL

SYNOPSIS

	       use Net::SSLGlue::SMTP;
	       my $smtp_ssl = Net::SMTP->new( $host,
		       SSL => 1,
		       SSL_ca_path => ...
	       );

	       my $smtp_plain = Net::SMTP->new( $host );
	       $smtp_plain->starttls( SSL_ca_path => ... );

DESCRIPTION

       Net::SSLGlue::SMTP extends Net::SMTP so one can either start directly with SSL or switch later to SSL using the STARTTLS command.

       By default it will take care to verify the certificate according to the rules for SMTP implemented in IO::Socket::SSL.

METHODS

       new The method "new" of Net::SMTP is now able to start directly with SSL when the argument "<SSL =" 1>> is given. In this case it will not
	   create an IO::Socket::INET object but an IO::Socket::SSL object. One can give the usual "SSL_*" parameter of IO::Socket::SSL to
	   "Net::SMTP::new".

       starttls
	   If the connection is not yet SSLified it will issue the STARTTLS command and change the object, so that SSL will now be used. The usual
	   "SSL_*" parameter of IO::Socket::SSL will be given.

       peer_certificate ...
	   Once the SSL connection is established the object is derived from IO::Socket::SSL so that you can use this method to get information
	   about the certificate. See the IO::Socket::SSL documentation.

       All of these methods can take the "SSL_*" parameter from IO::Socket::SSL to change the behavior of the SSL connection. The following
       parameters are especially useful:

       SSL_ca_path, SSL_ca_file
	   Specifies the path or a file where the CAs used for checking the certificates are located. This is typically "etc/ssl/certs" on UNIX
	   systems.

       SSL_verify_mode
	   If set to 0, verification of the certificate will be disabled. By default it is set to 1 which means that the peer certificate is
	   checked.

       SSL_verifycn_name
	   Usually the name given as the hostname in the constructor is used to verify the identity of the certificate. If you want to check the
	   certificate against another name you can specify it with this parameter.

SEE ALSO

       IO::Socket::SSL, Net::SMTP

COPYRIGHT

       This module is copyright (c) 2008, Steffen Ullrich.  All Rights Reserved.  This module is free software. It may be used, redistributed
       and/or modified under the same terms as Perl itself.

perl v5.14.2							    2012-04-06						   Net::SSLGlue::SMTP(3pm)