<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>Postfix and Linux</title> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> </head> <body> <h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and Linux</h1> <hr> <h2>Berkeley DB issues</h2> <p> On RedHat Linux 7.0 you must install the db3-devel RPM before you can compile the Postfix source code. </p> <p> Warning: do not use multiple Berkeley DB versions. 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 <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> </body> </html>