imapfeed: 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/lib/news/bin/imapfeed - from package: inn2

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

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