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Make sure you have all your /etc/hosts names correctly set up.
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Make sure you have all your /etc/hosts names correctly set up.

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I have verified the hosts file and in local DNS. there is no entry for this name c18-ss-1-lb.cnet.com. 
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I have verified the hosts file and in local DNS. there is no entry for this name c18-ss-1-lb.cnet.com.

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I have verified your article. Still problem is there.<br />
<br />

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I have verified your article. Still problem is there.



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I'm working with another question here <a href="https://www.experts-exchange.com/questions/24232125/How-can-i-prevent-invalid-domains-from-redirecting.html?anchorAnswerId=23925617#a23925617" rel="ugc">https://www.experts-exchange.com/questions/24232125/How-can-i-prevent-invalid-domains-from-redirecting.html?anchorAnswerId=23925617#a23925617</a>&nbsp;which have same sympton as yours. You can try check your resolv.conf file and ensure searchs parameter is defined with something like localdomain or a valid domain for this host.
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I'm working with another question here https://www.experts-exchange.com/questions/24232125/How-can-i-prevent-invalid-domains-from-redirecting.html?anchorAnswerId=23925617#a23925617 [https://www.experts-exchange.com/questions/24232125/How-can-i-prevent-invalid-domains-from-redirecting.html?anchorAnswerId=23925617#a23925617] which have same sympton as yours. You can try check your resolv.conf file and ensure searchs parameter is defined with something like localdomain or a valid domain for this host.

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I having one linux test pc. In that i have installed fc6 for testing purpose. I am relaying all my mails in that pc &nbsp;through my mail server. If i send any mail from that test pc i am reeving the mail like this. It showing root@c18-ss-1-lb.cnet.com.<wbr /> it not showing root@myhost.com it showing some other address. I am using sendmail in that test pc.<br />
<br />
&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;SNAP&gt;&gt;&gt;&gt;&gt;&gt;<wbr />&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;<wbr />&gt;&gt;&gt;&gt;.<br />
From: root@c18-ss-1-lb.cnet.com<br />
&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;SNAP&gt;&gt;&gt;&gt;&gt;&gt;<wbr />&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;<wbr />&gt;&gt;&gt;&gt;.<br />
<br />

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I having one linux test pc. In that i have installed fc6 for testing purpose. I am relaying all my mails in that pc  through my mail server. If i send any mail from that test pc i am reeving the mail like this. It showing root@c18-ss-1-lb.cnet.com. it not showing root@myhost.com it showing some other address. I am using sendmail in that test pc.

<<<<<<<<<<<<<<<<SNAP>>>>>>>>>>>>>>>>>>>>.
From: root@c18-ss-1-lb.cnet.com
<<<<<<<<<<<<<<<<SNAP>>>>>>>>>>>>>>>>>>>>.



root@c18-ss-1-lb.cnet.com

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.