About watermarks

Scott Silva ssilva at sgvwater.com
Wed Jun 4 16:49:52 IST 2008

on 6-4-2008 8:15 AM Charles Lacroix spake the following:
> Julian Field a �crit :
>> Charles Lacroix wrote:
>>> Mark Nienberg a �crit :
>>>> Charles Lacroix wrote:
>>>>> Hi,
>>>>> I had this configuration which reduced alot of bounces going into 
>>>>> user's mailbox.
>>>>> I was quite happy with this but today some users noticed that 
>>>>> gmail's vacation messages
>>>>> were beiing blocked.
>>>> The watermark feature examines all messages that have a null 
>>>> sender.  In sendmail logs these are the ones with:
>>>> "from=<>"
>>>> If gmail uses that approach to send vacation messages, and does not 
>>>> include the original message in the reply, then it will trigger the 
>>>> bad watermark action.   So if you want to be able to receive these 
>>>> and still use the watermark feature, maybe you could just add 2 or 3 
>>>> points for a bad watermark.
>>>> Mark
>>> As i said in the original post, i tried setting a few points to it 
>>> and it would mark it as spam and not check via spamassassin at all.
>>> Could i just build a ruleset like this:
>>> Check Watermarks With No Sender = rules/check.watermarks.rules
>>> From:  *.google.com   no
>>> From:  default  yes
>>> mail comes from hostnames similar to this: 'qb-out-0506.google.com'
>>> Sould this work?
>> No, as that "From:" will check the sender address and not the SMTP 
>> client IP address. The only way of forcing it to check an IP address 
>> is to put in the netblock definition of their outgoing IP addresses.
>>> Thanks
>> Jules
> Ok.
> #        /pattern-with-no-letters/ # Any SMTP client IP address matching 
> this
> #                                  # Perl regular expression
> How can i know all of gmail's outgoing smtp servers?
By their own SPF records.
_netblocks.google.com.  300     IN      TXT     "v=spf1 ip4: 
ip4: ip4: ip4: ip4: 
ip4: ip4: ip4: ip4: ?all"

By their own SPF records.

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