On 7/9/2010 14:40, Ram wrote:
On Fri, 2010-07-09 at 13:35 +0200, Administrator Beckspaced.com wrote:
On 7/9/2010 13:27, Robert Schetterer wrote:
Am 09.07.2010 12:51, schrieb Administrator Beckspaced.com:
hello robert,
thanks a lot for your quick reply ...
actually it is not always the same IP or host sending the error bounces ...
the bounces are sent from hundred of different IP addresses ...
any more idea?
Usually you can do very little to prevent forging your domain and
sending spam.
Some months ago one client of ours too had the same issue, but the issue
is very temporary.
The short term solution , as someone suggested, will be to temporarily
defer all NDR's with a sender check regex file like
/<>/ 450 Try Later
( The RFC's say you cant do this .. but sometimes you must be
practical :-) )
> From my personal experience I found that if , for your regular mailing
you use some sender authentication mechanism like SPF then these NDR's
significantly reduce. For eg many servers reject forged messages based
on SPF checks so you dont get NDR's from them at least.
I guess , spammers ( the more intelligent ones ... I mean ) too would
be less inclined to forge a domain that uses sender authentication
Because that will reduce the deliverability of their spams
Thanks
Ram
hello again robert & ram
thanks again for your ideas ...
so i had another search in google about that backscatter topic and sort
of found a nice, simple & also quick solution?
SAFE MODE with Postfix:
Edit /etc/postfix/main.cf:
smtpd_recipient_restrictions =
...
check_sender_access dbm:/etc/postfix/check_backscatterer
...
Create new file:/etc/postfix/check_backscatterer:
<> reject_rbl_client ips.backscatterer.org
postmaster reject_rbl_client ips.backscatterer.org
well ... had to change the postfix dbm lookup to hash and do a postmap
on the file ...
but now this seems to work as it already rejected a few emails according
to the mail log ...
more info can be found here ->
http://www.backscatterer.org
does anyone have any experience with that list?
is this a good longterm solution?
best regards
becki
--
Beckspaced.com - WebDesign, Hosting& Solutions
CEO Becki Beckmann
Marienplatz 9
97353 Wiesentheid
Germany
Phone: 09383-425
P.O. Box 15
Thongsala
84280 Koh Phangan
Suratthani / Thailand
Phone: 077-377 733
Mobile: 087-2828826
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