email2trac: 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/bin/email2trac - from package: trac-email2trac

You may install the required package with command apt-get install {package}
Error in other languages:
email2trac: bevel nie gevind nie
email2trac: comandă negăsită
email2trac: comando não encontrado
email2trac: commande introuvable
email2trac: command not found
email2trac: käsku ei ole
email2trac: không tìm thấy lệnh
email2trac: komanda nerasta
email2trac: Kommando nicht gefunden.
email2trac: kommandot finns inte
email2trac: komut yok
email2trac: nie znaleziono polecenia
email2trac: níor aimsíodh an t-ordú
email2trac: no se encontró la orden
email2trac: no s'ha trobat l'ordre
email2trac: opdracht niet gevonden
email2trac: parancs nem található
email2trac: perintah tidak ditemukan
email2trac: príkaz nenájdený
email2trac: příkaz nenalezen
email2trac: команда не найдена
email2trac: командата не е открита
email2trac: 命令找不到
email2trac: コマンドが見つかりません