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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::smtp::tls

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

NAME

       Net::SMTP::TLS - An SMTP client supporting TLS and AUTH

VERSION

       Version 0.12

SYNOPSIS

	use Net::SMTP::TLS;
	my $mailer = new Net::SMTP::TLS(
	       'your.mail.host',
	       Hello   =>      'some.host.name',
	       Port    =>      25, #redundant
	       User    =>      'emailguy',
	       Password=>      's3cr3t');
	$mailer->mail('emailguy@your.mail.host');
	$mailer->to('someonecool@somewhere.else');
	$mailer->data;
	$mailer->datasend("Sent thru TLS!");
	$mailer->dataend;
	$mailer->quit;

DESCRIPTION

       Net::SMTP::TLS is a TLS and AUTH capable SMTP client which offers an interface that users will find familiar from Net::SMTP. Net::SMTP::TLS
       implements a subset of the methods provided by that module, but certainly not (yet) a complete mirror image of that API.

       The methods supported by Net::SMTP::TLS are used in the above example. Though self explanatory for the most part, please see the perldoc
       for Net::SMTP if you are unclear.

       The differences in the methods provided are as follows:

	   The mail method does not take the options list taken by Net::SMTP

	   The to method also does not take options, and is the only method available to set the recipient (unlike the many synonyms provided by
	   Net::SMTP).

	   The constructor takes a limited number of Net::SMTP's parameters. The constructor for Net::SMTP::TLS takes the following (in addition
	   to the hostname of the mail server, which must be the first parameter and is not explicitly named):

	       NoTLS - In the unlikely event that you need to use this class to perform non-TLS SMTP (you ought to be using Net::SMTP itself for
	       that...), this will turn off TLS when supplied with a true value. This will most often cause an error related to authentication
	       when used on a server that requires TLS

	       Hello - hostname used in the EHLO command

	       Port - port to connect to the SMTP service (defaults to 25)

	       Timeout - Timeout for inital socket connection (defaults to 5, passed directly to IO::Socket::INET)

	       User - username for SMTP AUTH

	       Password - password for SMTP AUTH

TLS and AUTHentication
       During construction of an Net::SMTP::TLS instance, the full login process will occur. This involves first sending EHLO to the server, then
       initiating a TLS session through STARTTLS. Once this is complete, the module will attempt to login using the credentials supplied by the
       constructor, if such credentials have been supplied.

       The AUTH method will depend on the features returned by the server after the EHLO command. Based on that, CRAM-MD5 will be used if
       available, followed by LOGIN, followed by PLAIN. Please note that LOGIN is the only method of authentication that has been tested. CRAM-MD5
       and PLAIN login functionality was taken directly from the script mentioned in the acknowledgements section, however, I have not tested them
       personally.

ERROR HANDLING

       This module will croak in the event of an SMTP error. Should you wish to handle this gracefully in your application, you may wrap your mail
       transmission in an eval {} block and check $@ afterward.

ACKNOWLEDGEMENTS

       This code was blatantly plagiarized from Michal Ludvig's smtp-client.pl script. See <http://www.logix.cz/michal/devel/smtp> for his
       excellent work.

AUTHOR

       Alexander Christian Westholm, awestholm at verizon dawt net

       Improvements courtesy of Tomek Zielinski

perl v5.10.0							    2006-01-17						       Net::SMTP::TLS(3pm)