MAILER_DAEMON w/o host.domain

[Aco Dmitrovic <aco@srce.hr>]

Hi,

when sendmail replies with an error message, "From:" field on my Debian 
box looks like this:

Mail Delivery System <MAILER_DAEMON>

and I need something like this:

From: Mail Delivery System <MAILER_DAEMON@host.domain>

Any help?

Thank's,
Aco Dmitrovic
University Computing Centre
Zagreb,
Croatia