On Tue, Oct 18, 2005 at 10:01:18AM -0700, [EMAIL PROTECTED] wrote: > David F. Skoll wrote: > > [EMAIL PROTECTED] wrote: > >> ... for example, could I > >> subscribe to a mailing list with the unique address and expect that > >> "unique sender" algorithm will be able to uniquely identify list > >> mail? > > > > It depends on the mailing list software. I know it works fine with > > mailman. It will fail for mailing list software that changes the > > envelope sender with each posting, in which case the best you can do > > is lock to the domain instead of the complete sender address. > > OK, so for this list the email address would be locked to sender: > [EMAIL PROTECTED] > > But for the SpamAssassin list (for example), the senders are all different: > All the below are @spamassassin.apache.org: > users-return-33376-Matthew.van.Eerde=hbinc.com > users-return-33377-Matthew.van.Eerde=hbinc.com > users-return-33378-Matthew.van.Eerde=hbinc.com > ... > > So the best I could do is lock to @spamassassin.apache.org
If you want more options, you might want to look at the options in TMDA http://tmda.net/ . What David's invented is kind of a TMDA "sender locked" email address, except that the sender is only locked upon first arrival of an email. Clever idea, thanks for sharing. David: your proposal will use the envelope return-path, which means that it will fall down in case of VERP <http://cr.yp.to/proto/verp.txt> which is the case Matthew noticed, and in case of BATV <http://mipassoc.org/batv/draft-levine-mass-batv-00.txt>. VERP is only useful for mailinglists, and I haven't seen it anywhere else. Unfortunately, there are a few standards to choose from here, so it isn't always possible to extract the original address. Using the domain, as you said, is probably best. BATV will be somewhat more of a problem if it becomes widespread, but from what it looks now you can anticipate this, and extract the "original" address, or wildcard the variant bits. -- #!perl -wpl # mmfppfmpmmpp mmpffm <[EMAIL PROTECTED]> $p=3-2*/[^\W\dmpf_]/i;s.[a-z]{$p}.vec($f=join('',$p-1?chr(sub{$_[0]*9+$_[1]*3+ $_[2]}->(map{/p|f/i+/f/i}split//,$&)+97):qw(m p f)[map{((ord$&)%32-1)/$_%3}(9, 3,1)]),5,1)='`'lt$&;$f.eig; # Jan-Pieter Cornet _______________________________________________ Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
