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+OpenSMTPD is a FREE implementation of the server-side SMTP protocol
+as defined by RFC 5321, with some additional standard extensions.
+It allows ordinary machines to exchange e-mails with other systems
+speaking the SMTP protocol.
+
+You must have smtpd, smtpf, smtpl, and smtpq users on the system
+for privilege separation - something like this should suffice:
+useradd -u 270 -g 0 -r -s /bin/false -d /var/empty smtpd
+useradd -u 271 -g 0 -r -s /bin/false -d /var/empty smtpf
+useradd -u 272 -g 0 -r -s /bin/false -d /var/empty smtpl
+useradd -u 273 -g 0 -r -s /bin/false -d /var/empty smtpq
+
+You will want to add /etc/rc.d/rc.opensmtpd to rc.local so that it
+will start on boot (or perhaps consider symlinking rc.sendmail to
+rc.opensmtpd).
+
+This package conflicts with the stock sendmail package included in
+Slackware and overwrites some of its files if you do not remove it
+before.