Here is a step by step guide to configure OpenDKIM with Postfix
on Debian 12
We're gonna modify default configuration files to keep only minimal or required settings.
sudo apt-get install opendkim opendkim-tools
Sometimes I need to calculate a total disk usage of files older than a specified interval (days, months, years).
Here is a 1 liner to do that:
find . -type f -mtime +7 -print0 | du -hc --files0-from - | tail -n 1
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