Hi, I hope this helps.
As other have said, there has been a move to let systemctl manage log files, and we now access the logs via journalctl. That said, I did find this command returned some info: # grep "postfix\|open" /var/log/syslog Nov 29 02:20:35 mail postfix/postfix-script[1522]: starting the Postfix mail system Nov 29 02:20:35 mail postfix/master[1524]: daemon started -- version 3.5.25, configuration /etc/postfix But to manage postfix, I have been using these commands: # journalctl -u postfix or # journalctl -u postfix@-.service or if I have also implemented DKIM and DMARC, then # journalctl -u postfix@-.service -u opendkim -u opendmarc If in a terminal I want to monitor in real time I use the -f option: # journalctl -f -u postfix@-.service -u opendkim -u opendmarc I have seen the use of -t which allows the specification of multiple identifiers. journalctl -t postfix journalctl -t postfix -t postfix/anvil -t postfix/bounce -t postfix/cleanup -t postfix_container -t postfix/error -t postfix/local -t postfix/master -t postfix/pickup -t postfix/postalias -t postfix/postfix-script -t postfix/proxymap -t postfix/qmgr -t postfix/scache -t postfix/sendmail -t postfix/smtp -t postfix/smtpd -t postfix/tlsmgr -t postfix/trivial-rewrite https://man7.org/linux/man-pages/man1/journalctl.1.html To show all fields emitted by a unit and about the unit, option -u/--unit= should be used. -t, --identifier=SYSLOG_IDENTIFIER Show messages for the specified syslog identifier SYSLOG_IDENTIFIER. This parameter can be specified multiple times. Today I discovered this useful line ( read up on the options from "man journalctl" : journalctl --no-pager --quiet --identifier='postfix/smtp' --since='2022-10-30 00:00:00' --until='2024-12-06 23:59:59' --output='short' journalctl --no-pager --quiet --identifier='postfix/smtp' --since='2022-10-30 00:00:00' --until='2024-12-06 23:59:59' --output='short' PAGER CONTROL OPTIONS top The following options control page support: --no-pager Do not pipe output into a pager. -q, --quiet Suppresses all informational messages (i.e. "-- Journal begins at ...", "-- Reboot --"), any warning messages regarding inaccessible system journals when run as a normal user. -t, --identifier=SYSLOG_IDENTIFIER Show messages for the specified syslog identifier SYSLOG_IDENTIFIER. FILTERING OPTIONS top The following options control how to filter journal records: -S, --since=, -U, --until= Start showing entries on or newer than the specified date, or on or older than the specified date, respectively. -o, --output= Controls the formatting of the journal entries that are shown. Takes one of the following options: short is the default and generates an output that is mostly identical to the formatting of classic syslog files, showing one line per journal entry. Added in version 206. short-full is very similar, but shows timestamps in the format the --since= and --until= options accept. Unlike the timestamp information shown in short output mode this mode includes weekday, year and timezone information in the output, and is locale-independent. Added in version 232. George. On Friday, 29-11-2024 at 11:07 Bitfox wrote: > My OS is debian 12 without GUI. > > After I installed postifx by apt, I can't find the path to mail.log. > > the log file in /var/log doesn't exist. > > do you know where is my mail.log now? > > Thanks. > >
