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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
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<title>Postfix and Linux</title>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<body>
<h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and Linux</h1>
<hr>
<h2>Berkeley DB issues</h2>
<p> Warning: if you can't compile Postfix because the file "db.h"
isn't found, then you MUST install the Berkeley DB development
package (name: db???-devel-???) that matches your system library.
You can find out what is installed with the rpm command. For example:
</p>
<blockquote>
<pre>
$ <b>rpm -qf /usr/lib/libdb.so</b>
db4-4.3.29-2
</pre>
</blockquote>
<p> This means that you need to install db4-devel-4.3.29-2 (on
some systems, specify <tt>/lib/libdb.so</tt> in the rpm query). </p>
<p> DO NOT download some Berkeley DB version from the network.
Every Postfix program will dump core when it is built with a different
Berkeley DB version than the version that is used by the system
library routines. See the DB_README file for further information.
</p>
<h2>Procmail issues</h2>
<p> On RedHat Linux 7.1 and later <b>procmail</b> no longer has
permission
to write the mail spool directory. Workaround: chmod 1777
/var/spool/mail.
</p>
<h2>Syslogd performance</h2>
<p> LINUX <b>syslogd</b> uses synchronous writes by default. Because
of this, <b>syslogd</b> can actually use more system resources than
Postfix. To avoid such badness, disable synchronous mail logfile
writes by editing /etc/syslog.conf and by prepending a - to the
logfile name: </p>
<blockquote>
<pre>
/etc/syslog.conf:
mail.* -/var/log/mail.log
</pre>
</blockquote>
<p> Send a "<b>kill -HUP</b>" to the <b>syslogd</b> to make the
change effective. </p>
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