INSTALL and e-mail

Hi,

I'm on Ubuntu and installed from apt-get and don't see how to configure 
the "from" field for e-mail.  Tin is picking up "thufir@dur" which 
should be either "[email protected]" or "dur@localhost".

I looked through .tin and man tin, pardon, didn't see such a setting.

Trying to send a message directs me to read INSTALL, but I don't see 
that.  Surely I don't need to compile tin?

thanks,

Thufir