$c->add_dataset_trigger( "eprint", EP_TRIGGER_STATUS_CHANGE, sub{
    my( %o ) = @_;
 
    my $eprint = $o{dataobj};
    my $old_status = $o{old_status};
    my $new_status = $o{new_status};
 
    my $session = $eprint->get_session;
 
    my $user = $eprint->get_user(); #user that only editor/administrator only
 
    my $user_email = $user->get_value( "email" ); #when you are testing, set this to your email - so you don't spam people!
 

 
#   EXAMPLE of a deposit receipt
   if( $old_status eq "inbox" && $new_status eq "buffer" ){
       # send a deposit receipt?
       # Do something similar to the stuff below - but with different phrases!

        my $title = $eprint->render_value( "title" );
        my $users_name = $user->render_value( "name" );
 
        my $mail = $session->make_element( "mail" );
        $mail->appendChild( $session->html_phrase( "status_change_inbox_to_review_body",
            users_name => $users_name,
                 title => $title
        ) );
 
        my $userMailOK = EPrints::Email::send_mail(
            session => $session,
            langid => $session->get_langid,
            to_email => #EDITOR OR ADMINISTRATOR EMAIL?,
            subject => $session->phrase( "status_change_inbox_to_review_subject" ),
            message => $mail,
            sig => $session->html_phrase( "mail_sig" )
        );
 
   }
 
 
#    NOTIFICATION FOR LIVE ARCHIVE
   
    if( $old_status eq "buffer" && $new_status eq "archive" ){
        # you might want to check what the datestamp is - and not send an email if this item has
        # been moved from archive -> buffer -> archive for some reason.
 
        my $title = $eprint->render_value( "title" );
        my $users_name = $user->render_value( "name" );
        my $url = "" $eprint->get_url );
        $url->appendChild( $session->make_text( $eprint->get_url ) );
 
        my $mail = $session->make_element( "mail" );
        $mail->appendChild( $session->html_phrase( "status_change_buffer_to_archive_user_body",
            users_name => $users_name,
                 title => $title,
            eprint_url => $url
        ) );
 
        my $userMailOK = EPrints::Email::send_mail(
            session => $session,
            langid => $session->get_langid,
            to_email => $user_email,
            subject => $session->phrase( "status_change_buffer_to_archive_user_subject" ),
            message => $mail,
            sig => $session->html_phrase( "mail_sig" )
        );
 
        # you could check the value of $userMailOK - in case the email wasn't sent
    } # END of buffer-to-archive
 
});

Thank you