kabc2mutt: 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 CentOS possible default full paths are:

/usr/bin/kabc2mutt - from package: kdepim

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/kabc2mutt - from package: kaddressbook

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

Error in other languages:
kabc2mutt: bevel nie gevind nie
kabc2mutt: comandă negăsită
kabc2mutt: comando não encontrado
kabc2mutt: commande introuvable
kabc2mutt: command not found
kabc2mutt: käsku ei ole
kabc2mutt: không tìm thấy lệnh
kabc2mutt: komanda nerasta
kabc2mutt: Kommando nicht gefunden.
kabc2mutt: kommandot finns inte
kabc2mutt: komut yok
kabc2mutt: nie znaleziono polecenia
kabc2mutt: níor aimsíodh an t-ordú
kabc2mutt: no se encontró la orden
kabc2mutt: no s'ha trobat l'ordre
kabc2mutt: opdracht niet gevonden
kabc2mutt: parancs nem található
kabc2mutt: perintah tidak ditemukan
kabc2mutt: príkaz nenájdený
kabc2mutt: příkaz nenalezen
kabc2mutt: команда не найдена
kabc2mutt: командата не е открита
kabc2mutt: 命令找不到
kabc2mutt: コマンドが見つかりません