RE: [exim] enabling reverse lookup in exim

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Author: Philip Hazel
Date:  
To: RPraveenKumar
CC: exim-users
Subject: RE: [exim] enabling reverse lookup in exim
On Wed, 27 Oct 2004, RPraveenKumar wrote:

> thank you for your response i tested with sendmail -bh 210.212.219.72 where i got no host found
> but still it accepts the mail. How to block such kind of mails?


Ah. You did not say you wanted to *block* such hosts. You just said;

> >             I want to enable the reverse lookup in my mail server,
> >             Presently I am using exim-4.14 I already enabled host
> >             lookup=*


There are often legitimate hosts that don't have reverse lookups, so you
may end up losing real email. But if you want to do it, you can use a
statement such as

  deny condition = ${if eq{$sender_host_name}{}{yes}{no}}
       message = "Host name lookup failed"


in a suitable ACL.


-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.
Get the Exim 4 book:    http://www.uit.co.uk/exim-book