Hi,

For some reason, this field is missing in the substitution.
I have added it in Kernel/System/Ticket/SendAutoResponse.pm:
$Param{Body} =~ s/<OTRS_TICKET_ID>/$Param{TicketID}/gi;
(after the OTRS_TICKET_NUMBER replace)

this allows me to send the user Auto response that includes a direct link to the ticket:
http://www.softlink.com/otrs/customer.pl?Action=CustomerZoom&TicketID=16

is this the right way of doing this?

Regards,
Moshe