pmie_email: 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/libexec/pcp/bin/pmie_email - from package: pcp

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

On Debian possible default full paths are:

/usr/lib/pcp/bin/pmie_email - from package: pcp

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

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