Postfix-dovecot-squirrelmail in NetBSD 6.1 RC2 Warning: fd limit (ulimit -n)

[Edgar Rodolfo <rodolfobsd%gmail.com@localhost>]

Hi guys,

I am testing the rc2 i386, i am learning to use basic mail server on
NetBSD, currently i am doing a basic mail server with postfix, dovecot
and squirrelmail.

The warning that i see:
Warning: fd limit (ulimit -n) is lower than required under max. load
(768<1000), because of default_client_count.

then i see in my command line:

#ulimit -n
128

my question is:
where can i modify to increase some parameter? please :(, i know that
the file should be some in dovecot, but i do not know what is the file
:(, thank in advance for you reply :)