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<title>Postfix and Linux</title>

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<h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and Linux</h1>


<h2>Berkeley DB issues</h2>

<p> 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:

$ <b>rpm -qf /usr/lib/</b>

<p> This means that you need to install db4-devel-4.3.29-2 (on
some systems, specify "<b>rpm -qf /lib/</b>" instead). </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.

<h2>Procmail issues</h2>

<p> On RedHat Linux 7.1 and later <b>procmail</b> no longer has
to write the mail spool directory. Workaround: </p>

# chmod 1777 /var/spool/mail

<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>

    mail.*                          -/var/log/mail.log

<p> Send a "<b>kill -HUP</b>" to the <b>syslogd</b> to make the
change effective.  </p>