391 lines
6.7 KiB
HTML
391 lines
6.7 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>The /etc/mail/local-host-names file </TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.60"><LINK
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REL="HOME"
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TITLE="Securing and Optimizing Linux"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Software -Server/Mail Network"
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HREF="soser-mailn.html"><LINK
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TITLE="The /etc/mail/aliases and aliases.db files"
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HREF="chap22sec179.html"><LINK
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REL="NEXT"
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TITLE="The /etc/rc.d/init.d/sendmail script file"
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HREF="chap22sec181.html"></HEAD
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>Securing and Optimizing Linux: RedHat Edition -A Hands on Guide</TH
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WIDTH="10%"
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ALIGN="left"
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HREF="chap22sec179.html"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 22. Software -Server/Mail Network</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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HREF="chap22sec181.html"
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>Next</A
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="section"
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><H1
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CLASS="section"
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><A
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NAME="AEN12384"
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>22.8. The <TT
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CLASS="filename"
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>/etc/mail/local-host-names</TT
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> file</A
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></H1
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><DIV
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CLASS="note"
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><BLOCKQUOTE
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CLASS="note"
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><P
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><B
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><SPAN
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CLASS="inlinemediaobject"
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><IMG
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SRC="./images/Note.gif"
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ALT="Note"
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></IMG
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></SPAN
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>: </B
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>
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Please note that the <TT
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CLASS="filename"
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>/etc/mail/local-host-names</TT
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> file is for all type of configuration.
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</P
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></BLOCKQUOTE
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></DIV
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><P
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> The <TT
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CLASS="filename"
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>/etc/mail/local-host-names</TT
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> file is read to obtain alternative names for the local host. One use for such a file might be to declare a list of hosts in your network for which the
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local host is acting as the <TT
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CLASS="literal"
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>MX</TT
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> recipient. On that machine we simply need to add the names of machines for which it i.e. <TT
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CLASS="literal"
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>mail.openna.com</TT
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>, will handle mail to <TT
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CLASS="filename"
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>/etc/mail/local-host-names</TT
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>.
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Here is an example:
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</P
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><DIV
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CLASS="example"
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><A
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NAME="AEN12401"
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></A
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><P
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><B
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>Example 22-2. Alternative names</B
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></P
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><P
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> Create the local-host-names file, <B
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CLASS="command"
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>touch</B
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> <TT
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CLASS="filename"
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>/etc/mail/local-host-names</TT
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> and add the following line:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="programlisting"
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> # local-host-names - include all aliases for your machine here.
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openna.com
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deep.openna.com
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www.openna.com
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win.openna.com
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mail.openna.com
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</PRE
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></TD
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></TR
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></TABLE
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>
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With this type of configuration, all mail sent will appear as if it were sent from <TT
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CLASS="literal"
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>openna.com</TT
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>, and any mail sent to <TT
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CLASS="literal"
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>www.openna.com</TT
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> or the other hosts will be delivered to <TT
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CLASS="literal"
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>mail.openna.com</TT
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> our mail Hub.
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</P
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></DIV
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><DIV
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CLASS="caution"
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><P
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></P
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><TABLE
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CLASS="caution"
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BORDER="1"
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WIDTH="100%"
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><TR
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><TD
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ALIGN="CENTER"
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><B
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><SPAN
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CLASS="inlinemediaobject"
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><IMG
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SRC="./images/Caution.gif"
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ALT="Caution"
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></IMG
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></SPAN
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></B
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></TD
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></TR
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><TR
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><TD
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ALIGN="LEFT"
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><P
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> Please be aware that if you configure your system to masquerade as another, any e-mail sent from your system to your system will be sent to the machine you are masquerading as. For example, in the above illustration, log
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files that are periodically sent to <TT
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CLASS="email"
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><<A
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HREF="mailto:root@www.openna.com"
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>root@www.openna.com</A
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>></TT
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> by the cron daemon of Linux would be sent to <TT
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CLASS="email"
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><<A
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HREF="mailto:root@mail.openna.com"
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>root@mail.openna.com</A
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>></TT
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> our Mail Hub.
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</P
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></TD
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></TR
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></TABLE
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></DIV
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><DIV
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CLASS="section"
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><H2
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CLASS="section"
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><A
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NAME="AEN12420"
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>22.8.1. Configure the <TT
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CLASS="filename"
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>/etc/sysconfig/sendmail</TT
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> file</A
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></H2
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><P
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> The <TT
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CLASS="filename"
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>/etc/sysconfig/sendmail</TT
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> file is used to specify <TT
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CLASS="literal"
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>SENDMAIL</TT
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> configuration information, such as if sendmail should run as a daemon, if it should listen for mail or not, and how much time
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to wait before sending a warning if messages in the queue directory have not been delivered.
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</P
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><P
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> Create the sendmail file <B
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CLASS="command"
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>touch</B
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> <TT
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CLASS="filename"
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>/etc/sysconfig/sendmail</TT
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> and add in this file:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><PRE
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CLASS="programlisting"
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> DAEMON=yes <A
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NAME="dmys"
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><IMG
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SRC="../images/callouts/1.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(1)"></A
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>
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QUEUE=1h <A
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NAME="qeys"
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><IMG
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SRC="../images/callouts/2.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(2)"></A
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>
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</PRE
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></TD
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></TR
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></TABLE
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>
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<DIV
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CLASS="calloutlist"
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><DL
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COMPACT="COMPACT"
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><DT
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><A
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HREF="chap22sec180.html#dmys"
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><IMG
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SRC="../images/callouts/1.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(1)"></A
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></DT
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><DD
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> The <TT
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CLASS="envar"
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>DAEMON=yes</TT
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> option instructs Sendmail to run as a daemon. This line is useful when Sendmail client machines are configured to not accept mail directly from outside in favor of forwarding all local mail to a
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Central Hub, <EM
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>not running a daemon also improves security</EM
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>. If you have configured your server or client machines in this way, all you have to do is to replace the <TT
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CLASS="envar"
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>DAEMON=yes</TT
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> to <TT
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CLASS="envar"
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>DAEMON=no</TT
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>.
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</DD
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><DT
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><A
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HREF="chap22sec180.html#qeys"
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><IMG
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SRC="../images/callouts/2.gif"
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HSPACE="0"
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VSPACE="0"
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BORDER="0"
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ALT="(2)"></A
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></DT
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><DD
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> Mail is usually placed into the queue because it could not be transmitted immediately. The <TT
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CLASS="envar"
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>QUEUE=1h</TT
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> sets the time interval before sends a warning to the sender if the messages has not been delivered.
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</DD
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></DL
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></DIV
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>
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</P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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WIDTH="100%"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="chap22sec179.html"
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>Prev</A
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></TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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>Next</A
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>The <TT
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CLASS="filename"
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>/etc/mail/aliases</TT
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> and <TT
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CLASS="filename"
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>aliases.db</TT
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> files</TD
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>Up</A
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>The <TT
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CLASS="filename"
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>/etc/rc.d/init.d/sendmail</TT
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> script file</TD
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></TR
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