Re: SMTP Error Message
- From: stephen <stephen@xxxxxxxxxxxxxxx>
- Date: Wed, 10 May 2006 12:25:59 +0100
J.Lee wrote:
I have sent them an email requesting that 192.168.1.150 be removed from their list. I am waiting for a reply. This IP address is listed twice by the same company CASA-CBL and CASA-CBL+ so I am not sure if they will remove the IP address.
It is only meaningful to blacklist external IP addresses, not RFC1918 (internal, non-routeable) addresses like 192.168.1.150. There's no point in asking for it to be removed either.
Check your external IP in the spam database lookup test at www.dnsreport.com to see if it's blacklisted.
Your machine was saying "HELO server.company.local" when talking to other SMTP servers, but they're checking your external IP in the blocklists, not your internal address.
Some servers may do some DNS checks on the hostname you give in the HELO SMTP verb, but that's relatively uncommon. However, best practise is to fix your server so that it announces itself as company.com or mail.company.com or server.company.com (i.e a domain name with a valid MX record). It is also safer if the reverse DNS on your IP returns the same name as used in the HELO greeting.
You can change the name your server sends in SMTP HELO/EHLO by modifying the fully qualified domain name in ESM.
-- stephen
.
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