eximstats: 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/eximstats - from package: exim

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

On Debian possible default full paths are:

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

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

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