Re: [Mailman-Users] Fake Email

2009-11-12 Thread Mark Sapiro
Hien HUYNH HUU wrote: Again about this issue , Please guide me how to configure Approve Header for email policy ? And I wonder If using Microsoft Outlook or Outlook Express to send mail to list , can user set header for him ? I am not an Outlook expert by any means, but I don't think

Re: [Mailman-Users] Fake Email

2009-11-11 Thread Hien HUYNH HUU
=sbsc.com...@python.org [mailto:mailman-users-bounces+hien.hh=sbsc.com...@python.org] On Behalf Of Barry Warsaw Sent: Wednesday, November 11, 2009 12:15 PM To: Conrad Richter Cc: Mailman-Users@python.org Subject: Re: [Mailman-Users] Fake Email On Oct 31, 2009, at 12:47 PM, Conrad Richter wrote

Re: [Mailman-Users] Fake Email

2009-11-10 Thread Mark Sapiro
Conrad Richter wrote: Another way to deal with this is sender confirmation by email, where, like subscriber confirmation by email, a message is sent with a confirmation link. Mailman doesn't have this capability presently but it seems to me that since it already has subscriber confirmation, it

Re: [Mailman-Users] Fake Email

2009-11-10 Thread Barry Warsaw
On Oct 31, 2009, at 10:54 AM, Todd Zullinger wrote: I don't know if the patches at http://non-gnu.uvt.nl/mailman-ssls/ would be helpful here or not. It's an attempt to add some OpenPGP and S/MIME capabilities to Mailman. I'll take a closer look at some point, but I suspect they won't be

Re: [Mailman-Users] Fake Email

2009-11-10 Thread Barry Warsaw
On Oct 31, 2009, at 12:47 PM, Conrad Richter wrote: Another way to deal with this is sender confirmation by email, where, like subscriber confirmation by email, a message is sent with a confirmation link. Mailman doesn't have this capability presently but it seems to me that since it already

Re: [Mailman-Users] Fake Email

2009-11-09 Thread Conrad Richter
Barry Warsaw wrote: On Oct 31, 2009, at 1:28 AM, Stephen J. Turnbull wrote: A better way to do this would be to set up the MTA on Mailman's host to only deliver to the list address (ie, Mailman) if the sender has been authenticated (eg, with TLS). Or to use digital signatures for sender

Re: [Mailman-Users] Fake Email

2009-11-09 Thread Conrad Richter
Barry Warsaw wrote: On Oct 31, 2009, at 1:28 AM, Stephen J. Turnbull wrote: A better way to do this would be to set up the MTA on Mailman's host to only deliver to the list address (ie, Mailman) if the sender has been authenticated (eg, with TLS). Or to use digital signatures for sender

Re: [Mailman-Users] Fake Email

2009-11-09 Thread Conrad Richter
Barry Warsaw wrote: On Oct 31, 2009, at 1:28 AM, Stephen J. Turnbull wrote: A better way to do this would be to set up the MTA on Mailman's host to only deliver to the list address (ie, Mailman) if the sender has been authenticated (eg, with TLS). Or to use digital signatures for sender

Re: [Mailman-Users] Fake Email

2009-11-01 Thread Hien HUYNH HUU
: Saturday, October 31, 2009 12:28 PM To: Hien HUYNH HUU Cc: mailman-users@python.org Subject: [Mailman-Users] Fake Email Hien HUYNH HUU writes: I recognize that mailman can accept a fake sender . Example, I have a maillist with only an email account (x...@abc.com) can send messages

Re: [Mailman-Users] Fake Email

2009-11-01 Thread Geoff Shang
Hi, HOw would you propose such verification of the authenticity of a sender be performed in Mailman? It's hard enough to do anyway, but as has been pointed out, it's probably more the function of the MTA than of Mailman. The MTA can do things like insist on client-side certificates and

Re: [Mailman-Users] Fake Email

2009-11-01 Thread Mark Sapiro
Hien HUYNH HUU wrote: Hi Stephen, I can't do that because may be the sender is on another MTA and mailman server can't force they do an authentication. Is this a weak point of Mailman ? They still could connect and authenticate to the Mailman server's MTA for list posting purposes. If

Re: [Mailman-Users] Fake Email

2009-11-01 Thread Stephen J. Turnbull
Hien HUYNH HUU writes: Hi Stephen, I can't do that because may be the sender is on another MTA and mailman server can't force they do an authentication. Is this a weak point of Mailman ? No, this is a weak point of your MTA. The MTA has all the information needed, and in

Re: [Mailman-Users] Fake Email

2009-11-01 Thread Barry Warsaw
On Nov 1, 2009, at 9:06 PM, Stephen J. Turnbull wrote: If you really want Mailman to do the authentication, you can either use the Approved header field, which is not very secure, or you can use the 3rd-party patch to use public-key signatures which somebody else mentioned. I'm pretty sure

Re: [Mailman-Users] Fake Email

2009-10-31 Thread Barry Warsaw
On Oct 31, 2009, at 1:28 AM, Stephen J. Turnbull wrote: A better way to do this would be to set up the MTA on Mailman's host to only deliver to the list address (ie, Mailman) if the sender has been authenticated (eg, with TLS). Or to use digital signatures for sender verification. This is

Re: [Mailman-Users] Fake Email

2009-10-31 Thread Todd Zullinger
Barry Warsaw wrote: On Oct 31, 2009, at 1:28 AM, Stephen J. Turnbull wrote: A better way to do this would be to set up the MTA on Mailman's host to only deliver to the list address (ie, Mailman) if the sender has been authenticated (eg, with TLS). Or to use digital signatures for sender

[Mailman-Users] Fake Email

2009-10-30 Thread Hien HUYNH HUU
Dear all, I recognize that mailman can accept a fake sender . Example, I have a maillist with only an email account (x...@abc.com) can send messages to all emails in the list. But , if someone can send a fake From address is x...@abc.com, mailman will delivery messages to the list . This is

[Mailman-Users] Fake Email

2009-10-30 Thread Stephen J. Turnbull
Hien HUYNH HUU writes: I recognize that mailman can accept a fake sender . Example, I have a maillist with only an email account (x...@abc.com) can send messages to all emails in the list. But , if someone can send a fake From address is x...@abc.com, mailman will delivery