On 10-04-15 3:08 PM, "Dave Evans" <[email protected]> wrote:
> On Fri, Apr 09, 2010 at 11:52:06PM -0400, Frank DeChellis wrote:
>> Hi there,
>>
>> We run exim 4.67 and we have Barricade MX as our gateway filter. We
>> installed the filter and changed our MX record 3 weeks ago. The filter
>> works great, but lots of mail is still getting sent directly to our SMTP
>> server. I can say, with great certainty, that 100.1% of the email going
>> directly to our SMTP is spam.
>
> So, let me just check I've got this right:
>
> * Exim is accepting connections on port 25 from any IP
> * the Barricade box connects directly to Exim
> * so if Exim accepts a connection from the Barricade box, it should process
> the mail as normal
> * and if Exim accepts a connection from anywhere *other* than the Barricade
> box, it is (as you say) 100.1% spam
>
> Have I understood correctly so far?
>
> Final question: before you changed your MX record 3 weeks ago, was the TTL on
> that (old) DNS record less than 3 weeks?
>
> If yes, then your assertion about 100.1% spam is correct (give or take 0.1%),
> so you can either:
>
> * configure your firewall to allow connections to Exim only from the
> Barricade box
>
> or
>
> * have Exim deny all connections except those that come from the Barricade
> box (deny !hosts = $ip.of.barricade.box in acl_smtp_connect)
>
> If the Barricade box does something /other/ than connect directly to Exim,
> then none of what I've said above applies, and you should describe your set-up
> in more detail.
THANKS! You got it right. Sorry if I didn't add enough details. I have
many domains on this exim install but only 2 have the barricade box as the
primary MX. So. If I also add a line to the same check:
domains = +filtered_domains
Then it would allow direct connections for other domains, but for the
domains listed on filtered_domains it must come from the barricade box.
Is this correct?
Frank DeChellis
President, Internet Access Worldwide
Welland, Ontario, Canada
www.iaw.com
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