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When passing "--mailback", it seems to exit early with success, despite having errors in the patches. In my case, it was missing Signed-off-by. Here's what happened: $ b4 --version 0.16.0 $ b4 prep --check Checking patches using: /home/junterwurzacher/tiger/linux-tiger-v7.4-pre-tiger-suspend/scripts/checkpatch.pl -q --terse --no-summary --mailback --showfile --- ● efd1aef7f361: Input: rk805-pwrkey - enable the wakeup interrupt during system suspend [...] --- Success: 4, Warning: 0, Error: 0 Calling checkpatch.pl manually with the same command line: $ ./scripts/checkpatch.pl -q --terse --no-summary --mailback --showfile 0001-arm64-dts-rockchip-put-the-PMIC-into-sleep-mode-in-s.patch (no output, exit code 0) Dropping "--mailback" gives the expected ERROR. $ ./scripts/checkpatch.pl -q --terse --no-summary --showfile 0001-arm64-dts-rockchip-put-the-PMIC-into-sleep-mode-in-s.patch arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi:501: ERROR: Missing Signed-off-by: line(s) I have not analyzed it further yet. Thanks, Jakob [1] https://lore.kernel.org/all/a220ebd0-a28d-44cc-9a80-62382018348c@cherry.de/