On Fri, May 21, 2004 at 12:10:49PM -0300, Mariano Absatz wrote: > Now, one of the things people do to avoid being identified as spammers is to > manually use their hotmail or yahoo accounts. > > As I just witnessed a most innocent message hit by various RBLs, after > confirming the message was actually sent via webmail I noticed Yahoo and > hotmail are adding a sintactically valid trace header > (Received:) stating the IP address from where it received the > message: ...[example removed]...
To me this looks like an even more general problem! Horde-IMP (typical small wemailer) does the same, it adds a received-Line, which IP inserted the mail via Web-Browser. So IF some host is banned via RBL, it's banned via webmail too, and if Providers add the same line for authenticated SMTP, it would simply be impossible to mail from 'Home'/Dialups AT ALL! So it seems to be a general BAD THING to add the IP-of-sending-host IF the sender ist fully authenticated by an account! (How to explain that to the Providers and Authors of MTAs?) Stucki (postmaster at mi.fu-belrin.de)
