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
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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:

Final-Recipient: RFC822;
Action: failed
Status: 5.1.1
Remote-MTA: DNS; []
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.

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CALIBRE-SMTP(1) 						      calibre							   CALIBRE-SMTP(1)

calibre-smtp - part of calibre SYNOPSIS
calibre-smtp [options] [from to text] DESCRIPTION
Send mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it. text is the body of the email message. If text is not specified, a complete email message is read from STDIN. from is the email address of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP negotiation, the message headers are not modified. Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks. OPTIONS
--version show program's version number and exit -h, --help show this help message and exit -l, --localhost Host name of localhost. Used when connecting to SMTP server. -o, --outbox Path to maildir folder to store failed email messages in. -f, --fork Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures. -t, --timeout Timeout for connection -v, --verbose Be more verbose COMPOSE MAIL Options to compose an email. Ignored if text is not specified -a, --attachment File to attach to the email -s, --subject Subject of the email SMTP RELAY Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified. -r, --relay An SMTP relay server to use to send mail. --port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise. -u, --username Username for relay -p, --password Password for relay -e, --encryption-method Encryption method to use when connecting to relay. Choices are TLS, SSL and NONE. Default is TLS. WARNING: Choosing NONE is highly insecure SEE ALSO
The User Manual is available at Created by Kovid Goyal <> calibre-smtp (calibre 0.8.51) January 2013 CALIBRE-SMTP(1)