Original Message-
From: owner-postfix-us...@postfix.org
[mailto:owner-postfix-us...@postfix.org] On Behalf Of Matt Holgate
Sent: Wednesday, May 14, 2014 1:13 PM
To: postfix-users@postfix.org
Subject: Selective greylisting
Hi folks,
Most of the spam I receive these days tends to be malware w
On Wed, 14 May 2014 11:13:20 +0100
Matt Holgate wrote:
> I was wondering if greylisting would be a useful thing to try in an
> attempt to reduce the amount received?
Greylisting is great. The day that I implemented it I saw a 90%
reduction in spam. Don't hesitate.
> Problem is, I don't really
Am 14.05.2014 12:13, schrieb Matt Holgate:
> Hi folks,
>
> Most of the spam I receive these days tends to be malware with attached
> ZIP files. I run clamav which weeds out some of it out, but a large
> amount still seems to get through.
>
> I was wondering if greylisting would be a useful thing
On 14 May 2014, at 12:13, Matt Holgate wrote:
> Most of the spam I receive these days tends to be malware with attached ZIP
> files. I run clamav which weeds out some of it out, but a large amount still
> seems to get through.
>
> I was wondering if greylisting would be a useful thing to try i
Hi folks,
Most of the spam I receive these days tends to be malware with attached
ZIP files. I run clamav which weeds out some of it out, but a large
amount still seems to get through.
I was wondering if greylisting would be a useful thing to try in an
attempt to reduce the amount received?
Hi,
In <003D9CFDC4BC4D809B6802958A7E1EC7@vxcxc6cd28d6a9>
"selective greylisting with a long delay" on Sun, 10 Apr 2011 23:33:22 -0400,
"pf at alt-ctrl-del.org" wrote:
> Has anyone implemented or experimented with selectively
> greylisting specific networks,
On Tue, 12 Apr 2011 10:54:13 -0400
Kris Deugau articulated:
> Stan Hoeppner wrote:
> > Jerry put forth on 4/11/2011 4:39 PM:
> >> Stan Hoeppner articulated:
> >>> Why bother with this complex greylisting setup? Simply hammer
> >>> the big blocks with a CIDR entry and whitelist individual IPs in
Stan Hoeppner wrote:
Jerry put forth on 4/11/2011 4:39 PM:
Stan Hoeppner articulated:
Why bother with this complex greylisting setup? Simply hammer the big
blocks with a CIDR entry and whitelist individual IPs in the range
from which you need legit mail. If such IPs are used to send both
sno
On 4/12/2011 3:19 AM, Bernhard Rohrer wrote:
My first port of call here would be to enable features like
- DKIM
- SPF
- reverse DNS lookup for the connecting host, where several things can be done:
Nope. This class of spammers carefully follow the RFCs and
use SPF and DKIM.
- match con
My first port of call here would be to enable features like
- DKIM
- SPF
- reverse DNS lookup for the connecting host, where several things can be done:
- match connecting IP to hostname in helo or mail from
- match connecting ip to claimed sending domain in helo or mail from (check MX
and A)
pf at alt-ctrl-del.org put forth on 4/11/2011 7:32 PM:
> Just because most of the emails are spam, doesn't mean that most of
> their customers are spammers. After all, the spammers are sending a lot
> more mail than legit sites do.
>
> If the ISP has multiple /15's and /16's, I think that blockin
"Stan Hoeppner" Monday, April 11, 2011 4:43 PM
pf at alt-ctrl-del.org put forth on 4/10/2011 10:33 PM:
My thought on auto combating this is to use a CIDR list to kick these
networks (and only these networks) over to a greylist policy that delays
these emails for 4+ hours. By then, most of the b
Wietse Venema put forth on 4/11/2011 6:07 PM:
> Stan Hoeppner:
>> Have you heard of a case of an SMTP sender suing an SMTP receiver for
>> message rejection, and winning the case?
>
> http://www.spamhaus.org/organization/statement.lasso?ref=3
>
> They sued, and the US judge awarded them US$11.7 m
On 4/11/2011 7:07 PM, Wietse Venema wrote:
Stan Hoeppner:
Have you heard of a case of an SMTP sender suing an SMTP receiver for
message rejection, and winning the case?
http://www.spamhaus.org/organization/statement.lasso?ref=3
They sued, and the US judge awarded them US$11.7 million for damag
Stan Hoeppner:
> Have you heard of a case of an SMTP sender suing an SMTP receiver for
> message rejection, and winning the case?
http://www.spamhaus.org/organization/statement.lasso?ref=3
They sued, and the US judge awarded them US$11.7 million for damages.
Wietse
Jerry put forth on 4/11/2011 4:39 PM:
> On Mon, 11 Apr 2011 15:43:09 -0500
> Stan Hoeppner articulated:
>
>> pf at alt-ctrl-del.org put forth on 4/10/2011 10:33 PM:
>>
>>> My thought on auto combating this is to use a CIDR list to kick
>>> these networks (and only these networks) over to a greyli
On Mon, 11 Apr 2011 17:39:43 -0400
Jerry wrote:
> On Mon, 11 Apr 2011 15:43:09 -0500
> Stan Hoeppner articulated:
>
> > pf at alt-ctrl-del.org put forth on 4/10/2011 10:33 PM:
> >
> > > My thought on auto combating this is to use a CIDR list to kick
> > > these networks (and only these network
On Mon, 11 Apr 2011 15:43:09 -0500
Stan Hoeppner articulated:
> pf at alt-ctrl-del.org put forth on 4/10/2011 10:33 PM:
>
> > My thought on auto combating this is to use a CIDR list to kick
> > these networks (and only these networks) over to a greylist policy
> > that delays these emails for 4+
pf at alt-ctrl-del.org put forth on 4/10/2011 10:33 PM:
> My thought on auto combating this is to use a CIDR list to kick these
> networks (and only these networks) over to a greylist policy that delays
> these emails for 4+ hours. By then, most of the bad IPs would be listed
> in one or more RBL
Zitat von "pf at alt-ctrl-del.org" :
Has anyone implemented or experimented with selectively greylisting
specific networks, with a long delay? Let's say 4 hours...
If so, what are your results?
Background:
1. Greylisting seems to have lost much of its value, and I stopped
using it about a y
Has anyone implemented or experimented with selectively greylisting specific networks, with a long delay? Let's say 4
hours...
If so, what are your results?
Background:
1. Greylisting seems to have lost much of its value, and I stopped using it
about a year ago.
2. By using and monitoring the l
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