Hi,
I am running an exim box (Debian Linux with exim 3.31) that relays all
incoming mail for the customer's domain to their internal Netscape
mail server via a domainlist router (example.com netscape.example.com
bydns_a). Unfortunately, that netscape box is exploitable for the
percent hack and will happily relay mail to
localpart%other-domain@??? to localpart@other-domain.
So what I need is to prevent recipients with % in their local part to
reach the netscape box. This is what I have done:
DIRECTOR:
fail_percent:
driver = smartuser
local_parts = ^.*%
new_address = ":fail: no percent in local part here"
ROUTER:
fail_percent:
driver = domainlist
local_parts = ^.*%
route_list = "* localhost"
self = local
What I am now experiencing is that sometimes, when an e-mail comes in
with % in the _header_ sender, the receiving exim process starts
eating CPU and memory. Stracing the exim process shows a lot of name
server operations for localhost. When I comment out the router, the
mail goes through fine.
I don't know what is going on here, and what I might have been doing
wrong, but it might be possible that changing the router list to "*
localhost byname" will solve the problem. Any ideas what happens here?
Greetings
Marc
--
-------------------------------------- !! No courtesy copies, please !! -----
Marc Haber | " Questions are the | Mailadresse im Header
Karlsruhe, Germany | Beginning of Wisdom " | Fon: *49 721 966 32 15
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fax: *49 721 966 31 29
