comsatd: command not found

Have You tried accessing the binary with the full path?

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/comsatd - from package: mailutils-comsatd

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