pollrcvd: 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:

/var/spool/hylafax/bin/pollrcvd - from package: hylafax+

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

On Debian possible default full paths are:

/var/spool/hylafax/bin/pollrcvd - from package: hylafax-server

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

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