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DATE 2010-03-01

HANGOUT

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Key: Value:

Key: Value:

MESSAGE
DATE 2010-03-02
FROM Paul Robert Marino
SUBJECT Re: [NYLXS - HANGOUT] this should not get through
well that's sort of what its designed to do via several mechanisms
one of which is documented here
http://www.postfix.org/BUILTIN_FILTER_README.html

another one commonly used can be found here
http://www.postfix.org/ADDRESS_VERIFICATION_README.html
this one actually attempts to verify that the from email address is
legitimate.


But for the most part its usually done by looping the message through
one or more external filtering applications
http://www.postfix.org/MILTER_README.html
this method is also commonly used filter messages through Clam AV (Anti
Virus)

On 3/2/2010 4:09 PM, Ruben Safir wrote:
> On Mon, Mar 01, 2010 at 11:17:06AM -0500, Paul Robert Marino wrote:
>
>> the most efficient way to do it is in postfix prior to the delivery to
>> the mailing list server.
>> there are many anti-spoofing plugins you can use to attempt to detect
>> and block it.
>>
>>
>
> How is postifx going to do this unless it opens the mail and parses it.
> You don't want postfix to do that.
>
> Ruben
>
>
>>
>> On 2/26/2010 7:40 PM, Ron Guerin wrote:
>>
>>> Ruben Safir wrote:
>>>
>>>
>>>> I'm sorry, I missunderstood you. Your saying that the mbox client, for
>>>> lack of a better term, creates the From line in the mbox format from the
>>>> envelope, and that it isn't strictly a header?
>>>>
>>>> I think your right about that. I seem to remember reading that.
>>>>
>>>> That is a problem though. I can spoof any From: header with mutt in a
>>>> second and so can any spammer. How the heck can you protect the mailing
>>>> list?
>>>>
>>>>
>>>>
>>> You can spoof the entire contents of an email including the envelope.
>>> Nothing new there. I don't know much about Majordomo, but unless it has
>>> native anti-abuse features or a plugin architecture to add them
>>> yourself, this is all beside the point. By the time the message gets to
>>> Majordomo, the question of whether or not to accept it has already been
>>> made. You need to insert something in front of it, just like I'm
>>> finding myself doing with GNU Mailman.
>>>
>>> GNU Mailman happens to have a very nice integrated feature for dealing
>>> with list spam. But it doesn't apply that to mail that's just "passing
>>> through" to the administrative addresses. So in order to spare myself
>>> and everyone else who looks after the list from all the spam that tries
>>> to get sent to those addresses, I have to intercept the mail before it
>>> hits Mailman. That's what you're going to have to do as well in the
>>> absense of any internal anti-abuse functionality in Majordomo.
>>>
>>> But for the sake of completeness, I'm now going to reverse gears and
>>> assume that Majordomo does have internal anti-abuse features. If it
>>> does, and all it bases its decisions on is who the mail appears to be
>>> from, it's never going to be very useful because that's really the least
>>> useful thing for determining what's spam and what's not. Trust no one,
>>> analyze everything. Spam is still spam even when your mother sends it
>>> to you.
>>>
>>> - Ron
>>>
>>>
>>

  1. 2010-03-01 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] this should not get through
  2. 2010-03-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Catching the streams from Flash Video
  3. 2010-03-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: [jim-at-well.com: [conspire] open source
  4. 2010-03-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Phone Tech Wars
  5. 2010-03-02 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday March 2 6:00PM-8:00PM
  6. 2010-03-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] this should not get through
  7. 2010-03-02 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] this should not get through
  8. 2010-03-02 Paul Robert Marino <prmarino1-at-gmail.com> Re: [NYLXS - HANGOUT] this should not get through
  9. 2010-03-03 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics - agregate data types
  10. 2010-03-03 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics - agregate data
  11. 2010-03-03 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics - agregate data
  12. 2010-03-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  13. 2010-03-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics
  14. 2010-03-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] AlphaOne Labs invited you to the event "Ask-a-Sysadmin
  15. 2010-03-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Professors Open Source Summer Experience -at-RIT
  16. 2010-03-07 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] Professors Open Source Summer Experience -at-RIT
  17. 2010-03-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics Structs Unions and
  18. 2010-03-09 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] [JOB] System Administrator, NYC to 90k
  19. 2010-03-09 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [JOB] System Administrator, NYC to 90k
  20. 2010-03-10 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basics Structs Unions
  21. 2010-03-13 redpill <redpill-at-rcn.com> Subject: [NYLXS - HANGOUT] NYLXS Library?
  22. 2010-03-13 redpill <redpill-at-rcn.com> Subject: [NYLXS - HANGOUT] NYLXS Library?
  23. 2010-03-14 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  24. 2010-03-14 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  25. 2010-03-15 redpill <redpill-at-rcn.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  26. 2010-03-15 redpill <redpill-at-rcn.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  27. 2010-03-15 Contrarian <adrba-at-nyct.net> Re: [NYLXS - HANGOUT] NYLXS Library?
  28. 2010-03-15 Contrarian <adrba-at-nyct.net> Re: [NYLXS - HANGOUT] NYLXS Library?
  29. 2010-03-15 Contrarian <adrba-at-nyct.net> Re: [NYLXS - HANGOUT] NYLXS Library?
  30. 2010-03-15 Contrarian <adrba-at-nyct.net> Re: [NYLXS - HANGOUT] NYLXS Library?
  31. 2010-03-15 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  32. 2010-03-15 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  33. 2010-03-15 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  34. 2010-03-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop _ Syntax Basic: Flow Control Structures
  35. 2010-03-16 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday March 16 6:00PM-8:00PM
  36. 2010-03-16 redpill <redpill-at-rcn.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  37. 2010-03-16 redpill <redpill-at-rcn.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  38. 2010-03-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - Switches and Break
  39. 2010-03-17 einker <eminker-at-gmail.com> Subject: [NYLXS - HANGOUT] Revolution OS at Darress Theatre
  40. 2010-03-20 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] Free Software Round Table TONIGHT at 10PM (live streaming)
  41. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - Syntax Basics -- functions
  42. 2010-03-21 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] C++ Workshop - Syntax Basics -- functions
  43. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - Syntax Basics -- functions
  44. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - Syntax Basics -- functions
  45. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  46. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  47. 2010-03-21 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] C++ Workshop - Syntax Basics -- functions
  48. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - Syntax Basics -- functions
  49. 2010-03-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Tina Gasperson commented on Darin Gasperson's status...
  50. 2010-03-21 redpill <redpill-at-rcn.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  51. 2010-03-22 From: "Beau Gould" <bg-at-capitalmarketsp.com> Subject: [NYLXS - HANGOUT] [JOB] Systems Engineer, NYC | 90-100k
  52. 2010-03-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  53. 2010-03-24 einker <eminker-at-gmail.com> Subject: [NYLXS - HANGOUT] Free Software Award Winners Announced
  54. 2010-03-24 einker <eminker-at-gmail.com> Subject: [NYLXS - HANGOUT] Free Software Award Winners Announced
  55. 2010-03-25 redpill <redpill-at-rcn.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  56. 2010-03-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Library?
  57. 2010-03-25 swd <sderrick-at-optonline.net> RE: [NYLXS - HANGOUT] NYLXS Library?
  58. 2010-03-30 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday March 30 6:00PM-8:00PM

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