About watermarks

[Scott Silva]

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.
;; ANSWER SECTION:
_netblocks.google.com.  300     IN      TXT     "v=spf1 ip4:216.239.32.0/19 
ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 
ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ?all"

By their own SPF records.

-- 
MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 258 bytes
Desc: OpenPGP digital signature
Url : http://lists.mailscanner.info/pipermail/mailscanner/attachments/20080604/4c4af81c/signature.bin