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Full Discussion: sendmail : 550 host unknown
Top Forums UNIX for Advanced & Expert Users sendmail : 550 host unknown Post 10310 by Perderabo on Monday 12th of November 2001 02:23:48 PM
Old 11-12-2001
From the FAQS on Sunsolve:
Quote:
Description
Top


Sendmail not working - host unknown.

From Mailer-Daemon ....

550 user@abc.defghjk.com... Host unknown (Name server: abc.defghjk.com:
no data known)

Mail gateway defined with DNS MX record.

nslookup works ok.

mail user@machine.firm.nl works if machine.firm.nl appears as a DNS A
type record.

Solution Summary
Top


As there is no A type record to convert host name to address, you need
to tell sendmail to use DNS name lookup.

In /etc/mail/sendmail.cf in the Options section you need:

# Turn on the DNS name look up
OI

This is included in versions of sendmail.cf supplied with some patches
and included in Solaris 2.6
 

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dnssectools(3pm)					User Contributed Perl Documentation					  dnssectools(3pm)

NAME
Net::DNS::SEC::Tools::dnssectools - General routines for the DNSSEC-Tools package. SYNOPSIS
use Net::DNS::SEC::Tools::dnssectools; dt_adminmail($subject,$msgbody,$recipient); $zspath = dt_cmdpath('zonesigner'); $ftype = dt_findtype($path); DESCRIPTION
The dnssectools module provides a general set of methods for use with DNSSEC-Tools utilities. INTERFACES
The interfaces to the dnssectools module are given below. dt_adminmail(subject,msgbody,recipient) This routine emails a message to the administrative user listed in the DNSSEC-Tools configuration file. dt_adminmail() requires two parameters, both scalars. The subject parameter is the subject for the mail message. The msgbody parameter is the body of the mail message. A third parameter, recipient, may be given to specify the message's recipient. If this is not given, then the recipient will be taken from the admin-email record of the DNSSEC-Tools configuration file. If recipient is "nomail", then no message will be sent and success will be returned. Return values: 1 - the message was created and sent. 0 - an invalid recipient was specified. It relies on the the following dnssec-tools.conf configuration parameters: admin-email The email address that the mail should come from. mailer-type Should be one of: sendmail, smtp, qmail. This option is not required and will default to trying sendmail and qmail to deliever the mail. If mailer-server is set to a defined value but mailer-type is not, then mailer-type will default to mailer-server The server, if admin-mail is set to smtp, that the mail should be delivered to. dt_cmdpath(command) This routine returns the path to a specified DNSSEC-Tools command. command should be the name only, without any leading directories. The command name is checked to ensure that it is a valid DNSEC-Tools command, Return values: The absolute path to the command is returned if the command is valid. Null is returned if the command is not valid. dt_filetype(path) This routine returns the type of the file named in path. The rollrec and keyrec records contained therein are counted and a type determination is made. Return values: "keyrec" - At least one keyrec record was found and no rollrec records were found. "rollrec" - At least one rollrec record was found and no keyrec records were found. "mixed" - At least one rollrec record and at least one keyrec record were found. This is most likely an erroneous file. "unknown" - No rollrec records nor keyrec records were found. "nofile" - The specified file does not exist. COPYRIGHT
Copyright 2006-2012 SPARTA, Inc. All rights reserved. See the COPYING file included with the DNSSEC-Tools package for details. AUTHOR
Wayne Morrison, tewok@tislabs.com SEE ALSO
Mail::Send.pm(3), Net::DNS::SEC::Tools::conf.pm(3) POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 309: =back without =over perl v5.14.2 2012-06-28 dnssectools(3pm)
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