I have received a few email bounces recently indicating that nebka is blacklisted by barracuda. Each time, I went to the barracuda website and asked to be whitelisted. It is still going on. Thus I google for barracuda problems, and come across this: http://andrew.triumf.ca/barracuda-problems.html Seeing this, I try to understand whether nebka is subject to any of the discussed issues. Now, aras, aacis etc. resolve into the email addresses of Ivan, Thomas and me. However, when Ivan and Thomas are unreachable, messages bounce back to the sender, even if it is a pretend sender. It seems to be what triggers barracuda to think nebka is sending spam, it is in fact error messages replying to spam. I see several of those messages in /var/spool/exim4/input, for example: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: kurmanov@openlib.org (generated from root@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from root@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected ------ This is a copy of the message, including all the headers. ------ Return-path: <LolaoscarPierre@gamespy.com> Received: from cable200-116-62-113.epm.net.co ([200.116.62.113] helo=paola1af38a 7f8.une.net.co) by nebka.uconn.edu with smtp (Exim 4.63) (envelope-from <LolaoscarPierre@gamespy.com>) id 1JT6hN-0001Jn-Hp for root@authors.repec.org; Sat, 23 Feb 2008 21:34:41 -0500 Message-ID: <3016501c8768d$d2cb3c20$713e74c8@paola1af38a7f8> From: "Melody Lund" <LolaoscarPierre@gamespy.com> To: <root@authors.repec.org> Subject: eliminate Debt - Take Action Today Date: Sat, 23 Feb 2008 21:34:34 +0500 or This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: kurmanov@openlib.org (generated from aacis@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from aacis@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected ------ This is a copy of the message, including all the headers. ------ Return-path: <dzprd@adelphia.com> Received: from c-98-216-51-197.hsd1.ma.comcast.net ([98.216.51.197]) by nebka.uconn.edu with esmtp (Exim 4.63) (envelope-from <dzprd@adelphia.com>) id 1JTKpW-0007QU-27 for aacis@authors.repec.org; Sun, 24 Feb 2008 12:40:02 -0500 Message-ID: <000501c8770c$06189f5d$a489e58c@ncalip> From: "don max" <dzprd@adelphia.com> To: <aacis@authors.repec.org> Subject: Men and Women need Designer Shoes, Enjoy the Direct Wholesale Prices on Designer Footwear Date: Sun, 24 Feb 2008 15:52:39 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 So they say Designer Shoes are the new thing! etc... What are we to do? it looks like the spam filter Thomas installed on openlib.org is creating problems upstream... Christian Zimmermann FIGUGEGL! Department of Economics University of Connecticut 341 Mansfield Road, Unit 1063 Storrs, CT 06269-1063 http://ideas.repec.org/zimm/ christian.zimmermann@uconn.edu http://ideas.repec.org/e/pzi1.html
Christian Zimmermann writes
I have received a few email bounces recently indicating that nebka is blacklisted by barracuda. Each time, I went to the barracuda website and asked to be whitelisted. It is still going on.
Thus I google for barracuda problems, and come across this:
I looked at this. Unfortunately it is not dated. And I don't fully understand it. I am not an email expert.
Seeing this, I try to understand whether nebka is subject to any of the discussed issues. Now, aras, aacis etc. resolve into the email addresses of Ivan, Thomas and me. However, when Ivan and Thomas are unreachable, messages bounce back to the sender, even if it is a pretend sender. It seems to be what triggers barracuda to think nebka is sending spam, it is in fact error messages replying to spam.
I see several of those messages in /var/spool/exim4/input, for example:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
kurmanov@openlib.org (generated from root@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from root@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected
------ This is a copy of the message, including all the headers. ------
Return-path: <LolaoscarPierre@gamespy.com> Received: from cable200-116-62-113.epm.net.co ([200.116.62.113] helo=paola1af38a 7f8.une.net.co) by nebka.uconn.edu with smtp (Exim 4.63) (envelope-from <LolaoscarPierre@gamespy.com>) id 1JT6hN-0001Jn-Hp for root@authors.repec.org; Sat, 23 Feb 2008 21:34:41 -0500 Message-ID: <3016501c8768d$d2cb3c20$713e74c8@paola1af38a7f8> From: "Melody Lund" <LolaoscarPierre@gamespy.com> To: <root@authors.repec.org> Subject: eliminate Debt - Take Action Today Date: Sat, 23 Feb 2008 21:34:34 +0500
or
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
kurmanov@openlib.org (generated from aacis@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from aacis@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected
------ This is a copy of the message, including all the headers. ------
Return-path: <dzprd@adelphia.com> Received: from c-98-216-51-197.hsd1.ma.comcast.net ([98.216.51.197]) by nebka.uconn.edu with esmtp (Exim 4.63) (envelope-from <dzprd@adelphia.com>) id 1JTKpW-0007QU-27 for aacis@authors.repec.org; Sun, 24 Feb 2008 12:40:02 -0500 Message-ID: <000501c8770c$06189f5d$a489e58c@ncalip> From: "don max" <dzprd@adelphia.com> To: <aacis@authors.repec.org> Subject: Men and Women need Designer Shoes, Enjoy the Direct Wholesale Prices on Designer Footwear Date: Sun, 24 Feb 2008 15:52:39 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198
So they say Designer Shoes are the new thing! etc...
What are we to do? it looks like the spam filter Thomas installed on openlib.org is creating problems upstream...
I have spamassssin (SA) on the fafner, khufu, snefru and raneb, all the machines that receive mail. SA checks that the calling machine does figure on blacklists. nebka has no filter. The aras account gets hundreds of spam messages a day. Not good. If you don't filter, you get more spam. If your machine filters, over time you will get fewer spam. Here is what I suggest to day: (1) move the root disk to the large disk that Bob has given us. (2) upgrade system to Debian Stable. (3) install spamassassin with settings of snefru (4) close aacis account (5) start mirorring once a week (6) badblock check sda (1) has highest priority for me but it is the only job I can not do. All other jobs have the risk of crashing the machine crashing. I am happy to do all other jobs if/when the root file system is moved. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
What are we to do? it looks like the spam filter Thomas installed on openlib.org is creating problems upstream...
I have thought about this a little more on my way home. I think you are probably right, the problem comes from spam being received by nebka, forwarded to snefru, and being declared spam there. But removing the other spam filters is not an option. I used ot get so much spam that it because very difficult to find genuine mail. SA on nebka should be the way to get this sorted. nebka does not appear to be spam listed otherwise, so I think that security has not been compromised. That's an important comfort. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
On Mon, 25 Feb 2008, Thomas Krichel wrote:
Christian Zimmermann writes
I have received a few email bounces recently indicating that nebka is blacklisted by barracuda. Each time, I went to the barracuda website and asked to be whitelisted. It is still going on.
Thus I google for barracuda problems, and come across this:
I looked at this. Unfortunately it is not dated. And I don't fully understand it. I am not an email expert.
22 October 2007 Note that your spamassassin is bouncing spam instead of just deleting it. This is what is causing trouble.
Seeing this, I try to understand whether nebka is subject to any of the discussed issues. Now, aras, aacis etc. resolve into the email addresses of Ivan, Thomas and me. However, when Ivan and Thomas are unreachable, messages bounce back to the sender, even if it is a pretend sender. It seems to be what triggers barracuda to think nebka is sending spam, it is in fact error messages replying to spam.
I see several of those messages in /var/spool/exim4/input, for example:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
kurmanov@openlib.org (generated from root@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from root@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected
------ This is a copy of the message, including all the headers. ------
Return-path: <LolaoscarPierre@gamespy.com> Received: from cable200-116-62-113.epm.net.co ([200.116.62.113] helo=paola1af38a 7f8.une.net.co) by nebka.uconn.edu with smtp (Exim 4.63) (envelope-from <LolaoscarPierre@gamespy.com>) id 1JT6hN-0001Jn-Hp for root@authors.repec.org; Sat, 23 Feb 2008 21:34:41 -0500 Message-ID: <3016501c8768d$d2cb3c20$713e74c8@paola1af38a7f8> From: "Melody Lund" <LolaoscarPierre@gamespy.com> To: <root@authors.repec.org> Subject: eliminate Debt - Take Action Today Date: Sat, 23 Feb 2008 21:34:34 +0500
or
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
kurmanov@openlib.org (generated from aacis@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from aacis@authors.repec.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected
------ This is a copy of the message, including all the headers. ------
Return-path: <dzprd@adelphia.com> Received: from c-98-216-51-197.hsd1.ma.comcast.net ([98.216.51.197]) by nebka.uconn.edu with esmtp (Exim 4.63) (envelope-from <dzprd@adelphia.com>) id 1JTKpW-0007QU-27 for aacis@authors.repec.org; Sun, 24 Feb 2008 12:40:02 -0500 Message-ID: <000501c8770c$06189f5d$a489e58c@ncalip> From: "don max" <dzprd@adelphia.com> To: <aacis@authors.repec.org> Subject: Men and Women need Designer Shoes, Enjoy the Direct Wholesale Prices on Designer Footwear Date: Sun, 24 Feb 2008 15:52:39 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198
So they say Designer Shoes are the new thing! etc...
What are we to do? it looks like the spam filter Thomas installed on openlib.org is creating problems upstream...
I have spamassssin (SA) on the fafner, khufu, snefru and raneb, all the machines that receive mail. SA checks that the calling machine does figure on blacklists.
nebka has no filter. The aras account gets hundreds of spam messages a day. Not good. If you don't filter, you get more spam. If your machine filters, over time you will get fewer spam.
Here is what I suggest to day:
(1) move the root disk to the large disk that Bob has given us. (2) upgrade system to Debian Stable. (3) install spamassassin with settings of snefru (4) close aacis account (5) start mirorring once a week (6) badblock check sda
(1) has highest priority for me but it is the only job I can not do. All other jobs have the risk of crashing the machine crashing. I am happy to do all other jobs if/when the root file system is moved.
Cheers,
Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
Note that your spamassassin is bouncing spam instead of just deleting it.
Yes, that's what it should do.
This is what is causing trouble.
Not if we put it on forwarding machines too. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
On Mon, 25 Feb 2008, Thomas Krichel wrote:
Christian Zimmermann writes
Note that your spamassassin is bouncing spam instead of just deleting it.
Yes, that's what it should do.
Well bouncing seems to be a potential problem, according to the link I provided.
This is what is causing trouble.
Not if we put it on forwarding machines too.
Cheers,
Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
Well bouncing seems to be a potential problem, according to the link I provided.
Just because of this company's policy, and only if you forward a lot of spam. Accepting spam is not killing spam, it is saying to spamers, send more over there, somebody may be reading it. Login as aras to see the spam that's flying there. Believe me, I did not take the decision lightly to put up a spam filter. But I could not go without it. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
The problem is the following. SpamAssassin is bouncing to the reply-to address, which typically has nothing to do with the spamers. The recipient flags your bounce as spam, Barracuda picks that up, and we are blacklisted. So, just kill the spam, do not bounce. On Mon, 25 Feb 2008, Thomas Krichel wrote:
Christian Zimmermann writes
Well bouncing seems to be a potential problem, according to the link I provided.
Just because of this company's policy, and only if you forward a lot of spam.
Accepting spam is not killing spam, it is saying to spamers, send more over there, somebody may be reading it.
Login as aras to see the spam that's flying there.
Believe me, I did not take the decision lightly to put up a spam filter. But I could not go without it.
Cheers,
Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
The problem is the following. SpamAssassin is bouncing to the reply-to address, which typically has nothing to do with the spamers. The recipient flags your bounce as spam, Barracuda picks that up, and we are blacklisted.
No. Nebka is blacklisted. Nebka has no spam filter. Raneb, snefru, fafner, and khufu, all of which have spam filters, are not blacklisted. Nebka has a problem with just one spamlister, who stupidly thinks that the spam it forwards to the spamfiltered machines, and that gets spamfiltered there and rejected, is itself making nebka suspicious of spamming. That's the way I read this story.
So, just kill the spam, do not bounce.
There is no bounce. It's an smtp runtime error. It's the default behavior of the package. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
On Mon, 25 Feb 2008, Thomas Krichel wrote:
Christian Zimmermann writes
The problem is the following. SpamAssassin is bouncing to the reply-to address, which typically has nothing to do with the spamers. The recipient flags your bounce as spam, Barracuda picks that up, and we are blacklisted.
No. Nebka is blacklisted. Nebka has no spam filter. Raneb, snefru, fafner, and khufu, all of which have spam filters, are not blacklisted. Nebka has a problem with just one spamlister, who stupidly thinks that the spam it forwards to the spamfiltered machines, and that gets spamfiltered there and rejected, is itself making nebka suspicious of spamming. That's the way I read this story.
So, just kill the spam, do not bounce.
There is no bounce. It's an smtp runtime error. It's the default behavior of the package.
Then why do I find in the exim spool on nebka such message trying to get delivered? 1JTfdK-0001HL-DS-D This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: kurmanov@openlib.org (generated from root@nebka.openlib.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from root@nebka.openlib.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected ------ This is a copy of the message, including all the headers. ------ Return-path: <SelenasummarilyHoneycutt@yournameontoast.com> Received: from 84.124.233.198.dyn.user.ono.com ([84.124.233.198] helo=desktop) by nebka.uconn.edu with smtp (Exim 4.63) (envelope-from <SelenasummarilyHoneycutt@yournameontoast.com>) id 1JTfdA-0001HH-5J for root@nebka.openlib.org; Mon, 25 Feb 2008 10:52:40 -0500 Message-ID: 281fde01c877c6$1e23ed00$c6e97c54@desktop From: "Katy Queen" <SelenasummarilyHoneycutt@yournameontoast.com> To: <root@nebka.openlib.org> Subject: Get to know your new casino home! Date: Mon, 25 Feb 2008 16:47:00 -0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 Get $900 free casino bonus for new players, just sign up! http://ontiph.cn/ The header of this message is: 1JTfdK-0001HL-DS-H Debian-exim 107 102 <> 1203954770 0 -ident Debian-exim -received_protocol local -body_linecount 42 -allow_unqualified_recipient -allow_unqualified_sender -frozen 1203954772 -localerror XX 1 SelenasummarilyHoneycutt@yournameontoast.com 173P Received: from Debian-exim by nebka.uconn.edu with local (Exim 4.63) id 1JTfdK-0001HL-DS for SelenasummarilyHoneycutt@yournameontoast.com; Mon, 25 Feb 2008 10:52:50 -0500 065 X-Failed-Recipients: kurmanov@openlib.org, krichel@openlib.org 029 Auto-Submitted: auto-replied 061F From: Mail Delivery System <Mailer-Daemon@authors.repec.org> 049T To: SelenasummarilyHoneycutt@yournameontoast.com 059 Subject: Mail delivery failed: returning message to sender 048I Message-Id: <E1JTfdK-0001HL-DS@nebka.uconn.edu> 038 Date: Mon, 25 Feb 2008 10:52:50 -0500 There are currently 566 of them.
Cheers,
Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
Then why do I find in the exim spool on nebka such message trying to get delivered?
1JTfdK-0001HL-DS-D This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
kurmanov@openlib.org (generated from root@nebka.openlib.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from root@nebka.openlib.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected
This is a message that is generated by exim on nebka, saying it could not forward mail to root to me and Ivan. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
On Mon, 25 Feb 2008, Thomas Krichel wrote:
Christian Zimmermann writes
Then why do I find in the exim spool on nebka such message trying to get delivered?
1JTfdK-0001HL-DS-D This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
kurmanov@openlib.org (generated from root@nebka.openlib.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected krichel@openlib.org (generated from root@nebka.openlib.org) SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected
This is a message that is generated by exim on nebka, saying it could not forward mail to root to me and Ivan.
If SpamAssassin would just silently delete this message, there would not be a problem.
Cheers,
Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
If SpamAssassin would just silently delete this message, there would not be a problem.
SpamAssassin does just that, it assassinates spam. This is the way to get rid of it. Ignoring spam is not a way to get rid of it. Nowadays my boxes only get a fraction of the spam they used to get. This make the CPU time used of spam checking worth the cost. Just put up the same scenario on nebka. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
I have no doubt that your box is getting less spam. But just look at this exerpt of /var/log/exim4/mainlog on nebka: 2008-02-25 15:32:52 1JTk0K-0003Cs-5M <= BenniemignonManning@motivateus.com H=78-3-74-131.adsl.net.t-com.hr (stepince98f3bc) [78.3.74.131] P=smtp S=2044 id=381f701c877ed$97799020$1e01a8c0@stepince98f3bc 2008-02-25 15:33:00 1JTk0K-0003Cs-5M ** krichel@openlib.org <root@authors.repec.org> R=dnslookup T=remote_smtp: SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected 2008-02-25 15:33:00 1JTk0K-0003Cs-5M ** kurmanov@openlib.org <root@authors.repec.org> R=dnslookup T=remote_smtp: SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected 2008-02-25 15:33:00 1JTk0S-0003Cw-J8 <= <> R=1JTk0K-0003Cs-5M U=Debian-exim P=local S=3250 2008-02-25 15:33:00 1JTk0K-0003Cs-5M Completed 2008-02-25 15:33:02 1JTk0S-0003Cw-J8 ** benniemignonmanning@motivateus.com <BenniemignonManning@motivateus.com> R=dnslookup T=remote_smtp: SMTP error from remote mail server after RCPT TO:<BenniemignonManning@motivateus.com>: host emailguardian.awecomm.com [208.69.90.7]: 550 cuda_nsu 5.1.1 <BenniemignonManning@motivateus.com> User unknown; rejecting 2008-02-25 15:33:02 1JTk0S-0003Cw-J8 Frozen (delivery error message) The way I undertand the above: BenniemignonManning@motivateus.com or someone forging that address sends a message to root. That message is forwarded to krichel and kurmanov. But both reject, and the message is bounced to BenniemignonManning@motivateus.com, which rejects as well. the message is frozen. Now what if the user BenniemignonManning@motivateus.com actually existed? Then he would received message, could flag it as spam. Or his system could flag it at spam before reaching him. And where is the flagged message coming from? nebka. Christian Zimmermann FIGUGEGL! Department of Economics University of Connecticut 341 Mansfield Road, Unit 1063 Storrs, CT 06269-1063 http://ideas.repec.org/zimm/ christian.zimmermann@uconn.edu http://ideas.repec.org/e/pzi1.html On Tue, 26 Feb 2008, Thomas Krichel wrote:
Christian Zimmermann writes
If SpamAssassin would just silently delete this message, there would not be a problem.
SpamAssassin does just that, it assassinates spam. This is the way to get rid of it. Ignoring spam is not a way to get rid of it. Nowadays my boxes only get a fraction of the spam they used to get. This make the CPU time used of spam checking worth the cost.
Just put up the same scenario on nebka.
Cheers,
Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
Christian Zimmermann writes
2008-02-25 15:32:52 1JTk0K-0003Cs-5M <= BenniemignonManning@motivateus.com H=78-3-74-131.adsl.net.t-com.hr (stepince98f3bc) [78.3.74.131] P=smtp S=2044 id=381f701c877ed$97799020$1e01a8c0@stepince98f3bc 2008-02-25 15:33:00 1JTk0K-0003Cs-5M ** krichel@openlib.org <root@authors.repec.org> R=dnslookup T=remote_smtp: SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected 2008-02-25 15:33:00 1JTk0K-0003Cs-5M ** kurmanov@openlib.org <root@authors.repec.org> R=dnslookup T=remote_smtp: SMTP error from remote mail server after end of data: host snefru.openlib.org [128.252.177.195]: 550 Rejected 2008-02-25 15:33:00 1JTk0S-0003Cw-J8 <= <> R=1JTk0K-0003Cs-5M U=Debian-exim P=local S=3250 2008-02-25 15:33:00 1JTk0K-0003Cs-5M Completed 2008-02-25 15:33:02 1JTk0S-0003Cw-J8 ** benniemignonmanning@motivateus.com <BenniemignonManning@motivateus.com> R=dnslookup T=remote_smtp: SMTP error from remote mail server after RCPT TO:<BenniemignonManning@motivateus.com>: host emailguardian.awecomm.com [208.69.90.7]: 550 cuda_nsu 5.1.1 <BenniemignonManning@motivateus.com> User unknown; rejecting 2008-02-25 15:33:02 1JTk0S-0003Cw-J8 Frozen (delivery error message)
The way I undertand the above: BenniemignonManning@motivateus.com or someone forging that address sends a message to root. That message is forwarded to krichel and kurmanov. But both reject, and the message is bounced to BenniemignonManning@motivateus.com, which rejects as well. the message is frozen.
Spam uses forged return addresses.
Now what if the user BenniemignonManning@motivateus.com actually existed?
If the message is spam, it's return address does not exist.
Then he would received message, could flag it as spam. Or his system could flag it at spam before reaching him. And where is the flagged message coming from? nebka.
Yes, because nebka does not spam filter. Cheers, Thomas Krichel http://openlib.org/home/krichel RePEc:per:1965-06-05:thomas_krichel phone: +7 383 330 6813 skype: thomaskrichel
participants (2)
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Christian Zimmermann -
Thomas Krichel