Prior to installing Postfix you should
save
any existing sendmail program files as described in section 6. Be
sure to keep the old sendmail running for at least a couple days
to flush any unsent mail. To do so, stop the sendmail daemon and
restart it as:
# /usr/sbin/sendmail.OFF -q
Note: this is old sendmail syntax. Newer versions use separate
processes for mail submission and for running the queue.
After you have visited the "
Mandatory
configuration file edits" section below, you can start the
Postfix system with:
# postfix start
or, if you feel nostalgic, use the Postfix sendmail command:
# sendmail -bd -qwhatever
and watch your maillog file for any error messages. The pathname
is /var/log/maillog, /var/log/mail, /var/log/syslog, or someting
else. Typically, the pathname is defined in the /etc/syslog.conf
file.
% egrep '(reject|warning|error|fatal|panic):' /some/log/file
Note: the most important error message is logged first. Later
messages are not as useful.
In order to inspect the mail queue, use one of the following
commands:
% mailq
% sendmail -bp
% postqueue -p
See also the "
Care and feeding" section 12
below.
