Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread Jonas Eckerman
David Gibbs wrote: Since Mailman adds it's own headers to the messages it processes, any existing signatures in the message are invalidated. But... They aren't. Some may be, but not all. As an example, the post from mouss wich you replied to was verified with DKIM by our MX to be

Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread Matus UHLAR - fantomas
On Mon, 15 Jun 2009 09:29:13 +0200 Matus UHLAR - fantomas uh...@fantomas.sk wrote: On Sun, 14 Jun 2009 13:20:21 +0200 mouss mo...@ml.netoyen.net wrote: I am not as convinced as you: - this modifies the body, thus breaking signatures. when mail gets back to the same

Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread McDonald, Dan
On Tue, 2009-06-16 at 13:44 +0200, Matus UHLAR - fantomas wrote: On Mon, 15 Jun 2009 09:29:13 +0200 Matus UHLAR - fantomas uh...@fantomas.sk wrote: On 15.06.09 12:30, RW wrote: Would you care to elaborate? You comment makes no sense to me. the more people use DKIM/PGP, the less

Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread Jonas Eckerman
McDonald, Dan wrote: List servers like mailman resend the message with a different envelope header. Wich doesn't invalidate a DKIM, PGP or S/MIME signature. The MTA receiving this message looks for policy statements about spamassassin.apache.org, not for policy statements from fantomas.sk.

Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread SM
At 05:08 16-06-2009, McDonald, Dan wrote: Altering message bodies might break gpg|pgp signatures, but not DKIM. It generally invalidates the DKIM signature. This mailing list does not use Mailman. Regards, -sm

Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread Bill Landry
mouss wrote: Mailman has specific functionality to remove signature headers so that the message can be resigned as it's sent out. which doesn't help, because if I get mail claiming to come From: mo...@netoyen.net, yet it doesn't have a sig of mine, I don't really care if some fancy mailman

Re: List headers and footers [Re: Unsubscribe]

2009-06-16 Thread Benny Pedersen
On Tirs, Juni 16, 2009 03:13, David Gibbs wrote: Since Mailman adds it's own headers to the messages it processes, any existing signatures in the message are invalidated. Thus, Mailman has to remove any existing signatures and let the MTA resign the message after it's been processed. i am

Re: List headers and footers [Re: Unsubscribe]

2009-06-15 Thread Matus UHLAR - fantomas
On Sun, 14 Jun 2009 13:20:21 +0200 mouss mo...@ml.netoyen.net wrote: I am not as convinced as you: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender and final recipient in same domain), this may cause problems. I agree that many lists

Re: List headers and footers [Re: Unsubscribe]

2009-06-15 Thread Matus UHLAR - fantomas
On Jun 14, 2009, at 8:10 PM, Bill Landry wrote: If that happens then the message is no longer signed by the original sender, but rather by the mailing list. Probably not a big deal for a mailing list, but would be in any person-to-person communications. Chris Owen wrote: Why would

Re: List headers and footers [Re: Unsubscribe]

2009-06-15 Thread RW
On Mon, 15 Jun 2009 09:29:13 +0200 Matus UHLAR - fantomas uh...@fantomas.sk wrote: On Sun, 14 Jun 2009 13:20:21 +0200 mouss mo...@ml.netoyen.net wrote: I am not as convinced as you: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender

Re: List headers and footers [Re: Unsubscribe]

2009-06-15 Thread mouss
David Gibbs a écrit : Bill Landry wrote: This may be true if the sender were adding the footer before signing and sending the message to the list. However, not true if it's the mailing list that is adding the footer after the original sender has already signed the message. As I understand

Re: List headers and footers [Re: Unsubscribe]

2009-06-15 Thread mouss
RW a écrit : On Sun, 14 Jun 2009 13:20:21 +0200 mouss mo...@ml.netoyen.net wrote: I am not as convinced as you: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender and final recipient in same domain), this may cause problems. I agree that

Re: List headers and footers [Re: Unsubscribe]

2009-06-15 Thread David Gibbs
mouss wrote: Mailman has specific functionality to remove signature headers so that the message can be resigned as it's sent out. which doesn't help, because if I get mail claiming to come From: mo...@netoyen.net, yet it doesn't have a sig of mine, I don't really care if some fancy mailman

List headers and footers [Re: Unsubscribe]

2009-06-14 Thread mouss
David Gibbs a écrit : LuKreme wrote: The unsubscribe link is right there in plain sight. Whether Gmail conceals it from you has nothing to do with it. Few consumer mail clients (Gmail, Yahoo, Thunderbird, OE, Outlook, Lotus/Domino, etc) show the user headers by default. This means they

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread David Gibbs
mouss wrote: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender and final recipient in same domain), this may cause problems. I agree that many lists do break signatures so the receiving site should cope with this, but I am not sure they really

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread mouss
David Gibbs a écrit : mouss wrote: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender and final recipient in same domain), this may cause problems. I agree that many lists do break signatures so the receiving site should cope with this, but I am

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread LuKreme
On 14-Jun-2009, at 10:23, David Gibbs wrote: mouss wrote: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender and final recipient in same domain), this may cause problems. I agree that many lists do break signatures so the receiving site should

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread RW
On Sun, 14 Jun 2009 13:20:21 +0200 mouss mo...@ml.netoyen.net wrote: I am not as convinced as you: - this modifies the body, thus breaking signatures. when mail gets back to the same domain (sender and final recipient in same domain), this may cause problems. I agree that many lists do

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread David Gibbs
mouss wrote: - mail admin at example.com configures his mail system to sign all outbound mail with DKIM - he rejects any mail with a From: in his domain if it doesn't have a valid DKIM signature - j...@example.com posts to a list that appends a footer (or munges the Reply-To header, assuming

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread Bill Landry
David Gibbs wrote: mouss wrote: - mail admin at example.com configures his mail system to sign all outbound mail with DKIM - he rejects any mail with a From: in his domain if it doesn't have a valid DKIM signature - j...@example.com posts to a list that appends a footer (or munges the

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread David Gibbs
Bill Landry wrote: This may be true if the sender were adding the footer before signing and sending the message to the list. However, not true if it's the mailing list that is adding the footer after the original sender has already signed the message. As I understand it, in order for the

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread Bill Landry
David Gibbs wrote: Bill Landry wrote: This may be true if the sender were adding the footer before signing and sending the message to the list. However, not true if it's the mailing list that is adding the footer after the original sender has already signed the message. As I understand

Re: List headers and footers [Re: Unsubscribe]

2009-06-14 Thread Bill Landry
Chris Owen wrote: On Jun 14, 2009, at 8:10 PM, Bill Landry wrote: Mailman has specific functionality to remove signature headers so that the message can be resigned as it's sent out. If that happens then the message is no longer signed by the original sender, but rather by the mailing