[ILUG] Postfix rejecting mails that do not resolve.

[Gerard Keating]

One reason for this can be using a hosting company that does not provide
an SMTP service, which is not uncommon.

So you might have a user with xxxxx.ie as a domain, and using it for
incoming mail, but using the SMTP servers of which every ISP they use
for the outgoing mail.

I have seen this cause mail to be rejected before.

Gerard

-----Original Message-----
From: Jason Corcoran [mailto:jason.corcoran at activant.com] 
Sent: 06 October 2004 09:17
To: ilug at linux.ie
Subject: [ILUG] Postfix rejecting mails that do not resolve.


Using xname as a DNS I have set up my own postfix and apache web server.
Every now and again I notice this in the postfix log ....

Oct  6 08:01:49 mail postfix/smtpd[6296]: warning: 69.42.113.178: 
address not listed for hostname wrkst-113-178.woodinternet.net

if I ping this name I get

 >ping wrkst-113-178.woodinternet.net
PING wrkst-113-178.woodinternet.net (69.42.111.5) from 192.168.0.2 : 
56(84) bytes of data.


So the ips do not match. The host name and ips vary, I am wondering if 
this is a relay attempt or a spammers attempt to mail me. Should I be 
configuring postfix to accept these non listed hostnames. A postconf -n
tells me that disable_dns_lookups = yes so I shouldn't be doing DNS
lookups.

Any pointers ??

Thanks
Jason.

-- 
________________________________________
Senior Software Engineer,
Activant Solutions Ltd.
Longford Ireland.

Email : Jason.Corcoran at Activant.com
Aim   : JasonCorcoran9
Http  : http://www.activant.com
Phone : + 353 (0) 43 49202

-- 
Irish Linux Users' Group
http://www.linux.ie/mailman/listinfo/ilug/