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Full Discussion: Mail sending
Top Forums Shell Programming and Scripting Mail sending Post 302136527 by SanjayLinux on Tuesday 18th of September 2007 07:26:59 AM
Old 09-18-2007
Got IT and I think It will fix the Issue

Find out your ip address of your system by using "ifconfig" command
then find out your host name by using "hostname" command

#ifconfig<whatever the ip address> example
172.17.21.23
#hostname
< what ever the out will come > Example
tdm

then Just edit your /etc/hosts file
127.0.0.1 localhost tcs.com
127.0.0.1 localhost.localdomain localhost
172.17.21.23 tdm.tcs.com tdm TDM

----------------------------------------------
Let me explain you

this error appears to be caused in several ways, most related to DNS
name service. A few:
1. if your sending machine does not have it's own name/IPaddress in
its /etc/hosts file, it will cause the upstream target/relay host
to reject the message with something which means: "I don't know who
you are". The sending MTA sendmail then issues the error in the
maillog "...dsn=5.6.0 stat=Data Format Error". The fix for this is
to have a correct /etc/hosts; like so why i asked you to ediet the /etc/hosts file

And I am 100 % sure it will work for you

!!!BINGO!!!!!!!!

~~~Sanjay Tripathi ~~~~

Last edited by SanjayLinux; 09-18-2007 at 08:52 AM.. Reason: Just want much more explaination
 

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HOSTS(5)						     Linux Programmer's Manual							  HOSTS(5)

NAME
hosts - static table lookup for hostnames SYNOPSIS
/etc/hosts DESCRIPTION
This manual page describes the format of the /etc/hosts file. This file is a simple text file that associates IP addresses with hostnames, one line per IP address. For each host a single line should be present with the following information: IP_address canonical_hostname [aliases...] Fields of the entry are separated by any number of blanks and/or tab characters. Text from a "#" character until the end of the line is a comment, and is ignored. Host names may contain only alphanumeric characters, minus signs ("-"), and periods ("."). They must begin with an alphabetic character and end with an alphanumeric character. Optional aliases provide for name changes, alternate spellings, shorter hostnames, or generic hostnames (for example, localhost). The Berkeley Internet Name Domain (BIND) Server implements the Internet name server for UNIX systems. It augments or replaces the /etc/hosts file or hostname lookup, and frees a host from relying on /etc/hosts being up to date and complete. In modern systems, even though the host table has been superseded by DNS, it is still widely used for: bootstrapping Most systems have a small host table containing the name and address information for important hosts on the local network. This is useful when DNS is not running, for example during system bootup. NIS Sites that use NIS use the host table as input to the NIS host database. Even though NIS can be used with DNS, most NIS sites still use the host table with an entry for all local hosts as a backup. isolated nodes Very small sites that are isolated from the network use the host table instead of DNS. If the local information rarely changes, and the network is not connected to the Internet, DNS offers little advantage. FILES
/etc/hosts NOTES
Modifications to this file normally take effect immediately, except in cases where the file is cached by applications. Historical notes RFC 952 gave the original format for the host table, though it has since changed. Before the advent of DNS, the host table was the only way of resolving hostnames on the fledgling Internet. Indeed, this file could be created from the official host data base maintained at the Network Information Control Center (NIC), though local changes were often required to bring it up to date regarding unofficial aliases and/or unknown hosts. The NIC no longer maintains the hosts.txt files, though looking around at the time of writing (circa 2000), there are historical hosts.txt files on the WWW. I just found three, from 92, 94, and 95. EXAMPLE
# The following lines are desirable for IPv4 capable hosts 127.0.0.1 localhost # 127.0.1.1 is often used for the FQDN of the machine 127.0.1.1 thishost.mydomain.org thishost 192.168.1.10 foo.mydomain.org foo 192.168.1.13 bar.mydomain.org bar 146.82.138.7 master.debian.org master 209.237.226.90 www.opensource.org # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters SEE ALSO
hostname(1), resolver(3), host.conf(5), resolv.conf(5), resolver(5), hostname(7), named(8) Internet RFC 952 COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2017-09-15 HOSTS(5)
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