I am using incrond to monitor an mbox file (in /var/mail) for changes, but it is failing to trigger when postfix adds an incoming mail to the file. (It triggers fine however if I touch the file.)
I may be barking up the wrong tree but I wonder if this is because instead of merely appending to the existing mbox file, postfix/local rewrites the file so that its inode changes (which I know breaks incrond's ability to monitor a file). If so, is there a way to get postfix to append to the file without changing the inode, and if so what are the disadvantages? I have postfix 3.3.0, local has default settings, and /var/mail is on filesystem ext4 (options rw,relatime,data=ordered) under Ubuntu 18.04.1 (GNU/Linux 4.15).
