The mailbox was checked once every 30 minutes with a script that ran for 30 seconds, so simultaneous file access was high unlikely--but not impossible.
Hmmm. If you are 'reading' a mailbox, as a mail client might, then it seems you wouldn't run into the need to lock the file.
I'd would approach the problem like so:
# open $mboxfhandle for readonly
my @mbox = <$mboxfhandle>; # Let's use lots of memory
# rest of the process ...
Seems like this would catch each new message, and not conflict with any incoming messages.
( on further reflections, I imagine that a mail client must be able to mark messages as read, which would involve a write ... )
Nothing is too wonderful to be true
-- Michael Faraday
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