On Wed, 3 Dec 1997, The UNIX Mighty! wrote:
> by defualt exim rejects mail if reverse-dns is not resolved for
> the incoming ip rite?? (no/mismatch ptr record and so on....)
> eg
> ------------------------------------------------------------------------------
> 1997-12-03 16:08:27 connection from [207.155.118.xx] refused (reject host)
> ------------------------------------------------------------------------------
>
> how can I disable checking reverse dns calls or something...
This happens if you specify any wildcards in your sender_host_reject
list. If it can't look up the name, it can't check, and it takes the
hard line - otherwise somebody you are trying to lock out can just
remove their DNS entries to bypass your blocks.
There are several ways round this:
(1) Do not use wildcards in the block. If you use complete names, Exim
does a forward lookup when the daemon starts, and then checks IP
addresses.
(2) Set up your blocks using IP addresses instead of names; you can use
a net list to block a set of IP addresses.
(3) Wait for the next release of Exim, or install the testing version
which is currently available as Exim 1.750. This contains a new option
for host lists. If the item "+allow_unknown" appears, unresolved lookups
for subsequent items do not cause rejection.
--
Philip Hazel University Computing Service,
ph10@??? New Museums Site, Cambridge CB2 3QG,
P.Hazel@??? England. Phone: +44 1223 334714
--
*** Exim information can be found at
http://www.exim.org/ ***
