mailfwd_update.pl: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/share/gforge/bin/mailfwd_update.pl - from package: gforge-common

You may install the required package with command apt-get install {package}

Error in other languages:
mailfwd_update.pl: bevel nie gevind nie
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mailfwd_update.pl: perintah tidak ditemukan
mailfwd_update.pl: príkaz nenájdený
mailfwd_update.pl: příkaz nenalezen
mailfwd_update.pl: команда не найдена
mailfwd_update.pl: командата не е открита
mailfwd_update.pl: 命令找不到
mailfwd_update.pl: コマンドが見つかりません