On Nov 2, 2007 4:48 PM, Sean Darby  wrote:

quoted text
> Hi Stuart,

>

> Thank you very much for the info! I appreciate it a lot.

>

> I've now updated my /etc/mail/trusted-users file with my "sean@seandarby.com"

> address (which is what I currently have in my "from:" field in my muttrc).

er, no.
/usr/share/sendmail/README:

  names of users that will be ``trusted'', that is, able to

  set their envelope from address using -f without generating

  a warning message.
In other words, you list your local Unix user in the file, not an email address.
DS