exipick: 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/sbin/exipick - from package: exim

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

On Debian possible default full paths are:

/usr/sbin/exipick - from package: exim4-base

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

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