Werner Reisberger suggested:
I guess procmail is reading the whole mbox file into memory before
appending the mail.
No, it does not do this, nor does it need to.
It could be a problem with the settings of ulimit.
Look with ulimit how much memory a process is allowed to consume.
This could still be an issue if large messages are received, since
procmail DOES read the whole incoming message into memory
before processing.
Cheers,
Stan
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