My Voicemail doesn't send emails

Hello, I’ve been using Asterisk for almost a month now. I use Ubuntu 6.10 and I haven’t had any problems till now.

My problem is the following: when I leave an message in a mailbox, asterisk does not send an email to the address I wrote in voicemail.conf. Instead the following message pops up:

/bin/sh: /usr/sbin/sendmail: not found

I think I need to download and install sendmail, but I don’t really now how to do it.

Could anyone help me?

Thank you.

Could I get sendmail from Synaptic?