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/etc/init.d/qmail start script and ulimit

I installed qmail from .deb file and it created a start script in /etc/init.d/qmail.

In this file they set "ulimit -v 8192". According to comments to prevent DoS attacks.

What is the use of this?

I had to comment it to get qmail working with qmail-scanner.

I hate it when i need to change pre-configured files and i don't know why