[CentOS] postfix - reject of incoming mail due to helo check??

Fri Feb 3 16:22:06 UTC 2012
Ned Slider <ned at unixmail.co.uk>

On 02/02/12 21:08, Rob Kampen wrote:
> On 02/03/2012 06:35 AM, Ned Slider wrote:
>> On 02/02/12 15:44, Giles Coochey wrote:
>>> On 2012-02-02 15:39, Ned Slider wrote:
>>>> I would recommend removing reject_unknown_client from your
>>>> smtpd_sender_restrictions.
> I think this will allow the mail through - but when I look at my logs
> just in the last week we have over 5400 rejects due to unknown client
> and only 24 of these are from this client  - all the rest are junk.

Correct. I simply identified the problem and made a recommendation to 
fix it (i.e, prevent it from happening). As I said before there are more 
reliable ways to block spam than relying on correctly configured/working 
upstream DNS.


> Final question for the list - does anyone use "reject_unknown_client" -
> it has given me the most grief with legitimate clients that have poorly
> administered domains.

Hence my recommendation to remove it. But it's your server and your mail 
flow, ymmv :-)