From: D Hill (d.hillyournetplus.com)
Date: Fri May 02 2008 - 01:35:21 CDT

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On Thu, 1 May 2008 at 23:10 -0700, lists-postfixcappella.us confabulated:

> Anant S Athavale wrote:
>> Dear D Hill,
>>
>> I want to know, how to log the entry of introducing host in the logs when
>> it is correct and resolvable. (ie. mail does not get rejected, during that
>> time).
>
> I'm not clear if you want to do this for a specific host, set of hosts, or
> all. Regardless, you could create a WARN action in a helo access check:
>
> main.cf:
> smtpd_recipient_restrictions =
> ...
> permit_mynetworks
> reject_unauth_destination
> check_helo_access pcre:/etc/postfix/helo_checks.pcre
> ...
>
> /etc/postfix/helo_checks.pcre:
> ...
> /./ WARN sample helo WARN log entry
>
> This will generate WARN log entries such as :
>
> May 1 22:57:36 glacier postfix/smtpd[18974]: NOQUEUE: warn: RCPT from
> example.com[10.0.0.1]: sample helo warn log entry; from=<meexample.com>
> to=<meexample.com> proto=ESMTP helo=<example.net>
>
> Perhaps not a good long term solution, but gives you the data you seek.

You are correct. I didn't thing of creating a warn after the helo checks
so the entry would be logged.

>> Quoting D Hill :
>>
>>> On Fri, 2 May 2008 at 10:38 +0530, anant at isac.gov.in confabulated:
>>>
>>>> Dear List:Following is one line from the postfix logs.
>>
>> ---------------------------------------------------------------------------------
>> May 2 10:05:44 dnserns.isac.gov.in: postfix/smtpd[1536248]: NOQUEUE:
>> reject: RCPT from unknown[72.3.227.162]: 502 5.7.1 : Helo command
>> rejected: Host not found; from= to= proto=SMTP helo=
>>
>> ------------------------------------------------------------------------------As
>> per the above example, as we have used the policy of
>> reject_unknown_hostname and the mails where introducing host is not
>> resolvable are getting rejected.Now, when the users complain that,
>> some mails are not getting delivered to them, we go through logs and
>> find the reason like one above and inform that this is due to this
>> and tell the sender also to look into their configuration and resolve
>> the issue. And most of the times, they solve the issue.But, when they
>> solve, I want to know what their system is now introducing itself as.
>> How can I make it part of log? Can it also
>>>> b
>>> ecome part of Mail headers?Regards, ANANT.
>>>
>>> Disreguard my previous response. I didn't quite know what the helo log
>>> lines contained. You should be looking for lines that have the content:
>>>
>>> Helo command rejected
>

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