On 16Dec2014 15:23, Patrick asked me to provide a recipe for unmangling the
"From:" headers of posts to list like sed-us...@yahoogroups.com which rewrite
the "From:" headers of their posts to honour the rules of DMARC authentication.
The glaring example for me is the sed-us...@yahoogroups.com list, which moved
to DKIM authentication last year, and as a consequence had to rewrite the From:
headers on every outbound message to be from sed-users, not the author. For
example, a post from me would arrive with this From: header:
From: "Cameron Simpson c...@zip.com.au [sed-users]" <sed-us...@yahoogroups.com>
I now automatically reverse that on receipt.
As hoped, I've found time in the last week or so to:
- upgrade my mailfiler tool to support a hdr:s/this/that/ header
rewriting rule
- use that to write a rule to unmangle sed-users posts, restoring
correct From: headers to be the message author
- pull that rule out into a sed script that can be used in procmail recipes
So here we go:
First up my mailfiler(1cs) rules. Mailfiler is a tool of my own which I use to
file my email. You can track it here:
https://bitbucket.org/cameron_simpson/css/commits/branch/mailfiler
I'm using these rules to file my sed-users email:
from:s/"(?P<fullname>.*\S)\s+(?P<coreaddr>\S+@\S+)\s+\[sed-users\]".*<sed-us...@yahoogroups.com>/"$fullname"
<$coreaddr>/
sender:sed-us...@yahoogroups.com
from:/<sed-us...@yahoogroups.com>
from:s/"(?P<coreaddr>\S+@\S+)\s+\[sed-users\]".*<sed-us...@yahoogroups.com>/<$coreaddr>/
sender:sed-us...@yahoogroups.com
from:/<sed-us...@yahoogroups.com>
sh SedUsers to,cc,sender,x-apparently-to:sed-us...@yahoogroups.com
Second, the sed script to do the same thing on suitable messages:
https://bitbucket.org/cameron_simpson/css/src/tip/bin/fix-dkim-from
Finally, the matching procmailrc recipe (untested) to use in your own procmail
recipes:
:0whf
* from:.*<sed-us...@yahoogroups.com>
| fix-dkim-from
Questions, comments, requests welcomed!
Also, should this go in the wiki, and if so, where?
Cheers,
Cameron Simpson <c...@zip.com.au>
Microsoft Mail: as far from RFC-822 as you can get and still pretend to care.
- Abby Franquemont-Guillory <abb...@tezcat.com>
