Friday, May 03, 2002, 12:51:25 PM, you wrote:
> On Fri, 3 May 2002, Stanier, Alan M wrote:
> > 2002-05-03 11:06:22 recipients from [64.156.187.126] refused
> > (failed to find host name from IP address)
The reason is shown - DNS failure.
> conduct a manual test (-bh), that might reveal more information.
After exim died on an incoming connection, I did some tracking
revealing a bug for non-resolvable IP-addresses:
When host_name_lookup() gets a TRY_AGAIN, host_lookup_failed is not
changed (and sender_host_name is not filled). This happens twice, but
if even the second call to host_name_lookup() fails with TRY_AGAIN,
strcmpic() is called with a NULL-pointer (sender_host_name).
A quick patch for this is (not officical, of course):
--- ../exim-4.04.orig/src/smtp_in.c Thu Apr 18 10:08:34 2002
+++ src/smtp_in.c Fri May 3 13:25:18 2002
@@ -1878,5 +1878,8 @@
if (!host_lookup_failed)
{
- helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0;
+ if(sender_host_name != NULL)
+ helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0;
+ else
+ helo_verified = FALSE;
if (helo_verified)
--
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