Ruud told Erik,
See `man procmail`:
<quote>
When delivering to directories, MH folders, or maildir folders, you
don't need to use lockfiles to prevent several concurrently running
procmail programs from messing up.
</quote>
Years ago someone on this list insisted to me off-list that only
maildirs were invulnerable to race condition problems and could be used
safely without lockfiles, that classic procmail directories and MH
folders could potentially have trouble. None of his argument made
sense, but that could be because I didn't understand it all.
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