Re: [exim] Exim 4.72: preventing backscatter

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Author: Always Learning
Date:  
To: Exim
Subject: Re: [exim] Exim 4.72: preventing backscatter

On Thu, 2014-08-28 at 14:56 +0300, Lena@??? wrote:

> Make sure that in acl_check_rcpt you have before any "accept":
>
> require verify = recipient


............................. et cetera, et cetera ........

My personal advice is: STOP being a willing victim to SPAM.

There is no need for anyone to be a willing recipient of the junk mail
being targeted at your MTAs.

1. Reject everything which does NOT have a Host Name.

2. Reject everything which does NOT have a Reverse DNS (meaning the Host
IP has a Host Name and that Host Name resolves to the original Host IP
address)

3. Reject everything that appears to come from a
non-professional/non-official host name, for example here are a few of
today's rejects (rejected by our servers in ACL Connection)

181-160-30-166.baf.movistar.cl
83-144-106-204.static.chello.pl
host094101048197.static.milliway.it
121.243.32.138.static-chennai.vsnl.net.in
abts-north-dynamic-213.241.64.182.airtelbroadband.in
114-43-242-226.dynamic.hinet.net
cm-staticIP-85-152-39-135.telecable.es
6.99.158.88.radiocom.ro
095-097-099-043.static.chello.nl
IGLD-84-229-28-200.inter.net.il
host-91-242-170-6.gov.yanao.ru
wsip-70-167-121-10.sd.sd.cox.net

4. Further checks can be done with the HELO/EHLO and then with the RCPT.

If serious people want to send you and your colleagues real mail, then
those senders should properly configure their outgoing MTAs. Meekly
accepting slovenly configured sending MTAs merely perpetuates the Spam
disease.

Don't lay down in defeat and let the spammers walk all over you. Start
rejecting the crap at the earliest opportunity - even if that is not
"politically correct".

If you program/configure Exim to reject the vast majority of the Spam,
then you will need less elaborate external "extras". Exim is excellent
at rejecting many types of unwanted junk mail.

(will shortly update the other thread about 'trapping')

--
Regards,

Paul.
England, EU.

Centos, Exim, Apache, Libre Office.
Linux is the future. Micro$oft is the past.