nanog mailing list archives
Re: Spammers Skirt IP Authentication Attempts
From: Stephane Bortzmeyer <bortzmeyer () nic fr>
Date: Fri, 10 Sep 2004 09:55:55 +0200
On Wed, Sep 08, 2004 at 03:15:14PM -0500, Robert Bonomi <bonomi () mail r-bonomi com> wrote a message of 37 lines which said:
Same thing applies for 'simple' forwarding via sendmails '~/.forward' mechanism. the mail server 'accepts' the mail from the original source, and then 're-sends' to the new destination. That re-send originates as the _forwarding_party_, WITH an 'envelope from' of that forwarding party,
Sorry, this is simply not true (sendmail, postfix, etc, always keep the original envelope from when forwarding).
An SPF check of the _immediate_ sender does *NOT* break forwarded mail.
Even SPF people say it: http://spf.pobox.com/faq.html#forwarding
Current thread:
- Re: Spammers Skirt IP Authentication Attempts, (continued)
- Re: Spammers Skirt IP Authentication Attempts Paul Vixie (Sep 08)
- Very peculiar Telnet probing (possibly spoofed?) Jeff Kell (Sep 08)
- Re: Very peculiar Telnet probing (possibly spoofed?) Suresh Ramasubramanian (Sep 08)
- Re: Very peculiar Telnet probing (possibly spoofed?) Chris Brenton (Sep 09)
- Re: Spammers Skirt IP Authentication Attempts [operational content at end] Rich Kulawiec (Sep 09)
- Re: Spammers Skirt IP Authentication Attempts Edward B. Dreger (Sep 06)
- Re: Spammers Skirt IP Authentication Attempts Paul Jakma (Sep 08)
- Re: Spammers Skirt IP Authentication Attempts Robert Bonomi (Sep 08)
- Re: Spammers Skirt IP Authentication Attempts Robert Bonomi (Sep 08)
- Re: Spammers Skirt IP Authentication Attempts Daniel Reed (Sep 08)
- Re: Spammers Skirt IP Authentication Attempts Stephane Bortzmeyer (Sep 10)
- Re: Spammers Skirt IP Authentication Attempts Joe Rhett (Sep 10)
- Re: Spammers Skirt IP Authentication Attempts Stephane Bortzmeyer (Sep 10)