perdition.imap4: 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/sbin/perdition.imap4 - from package: perdition

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

Error in other languages:
perdition.imap4: bevel nie gevind nie
perdition.imap4: comandă negăsită
perdition.imap4: comando não encontrado
perdition.imap4: commande introuvable
perdition.imap4: command not found
perdition.imap4: käsku ei ole
perdition.imap4: không tìm thấy lệnh
perdition.imap4: komanda nerasta
perdition.imap4: Kommando nicht gefunden.
perdition.imap4: kommandot finns inte
perdition.imap4: komut yok
perdition.imap4: nie znaleziono polecenia
perdition.imap4: níor aimsíodh an t-ordú
perdition.imap4: no se encontró la orden
perdition.imap4: no s'ha trobat l'ordre
perdition.imap4: opdracht niet gevonden
perdition.imap4: parancs nem található
perdition.imap4: perintah tidak ditemukan
perdition.imap4: príkaz nenájdený
perdition.imap4: příkaz nenalezen
perdition.imap4: команда не найдена
perdition.imap4: командата не е открита
perdition.imap4: 命令找不到
perdition.imap4: コマンドが見つかりません