[ALUG] Yahoo and AOL DMARC policy

[Andreas Tauscher]

If you are running a Mailinglist:
Yahoo and AOL have set their DMARC policy to absolutely strict.

Mails from Yahoo and AOL users to a not DMARC conform list will be 
rejected by nearly all mail servers.

DMARC is only a draft and hoping to become a RFC, but it is very 
effective to prevent pishing mails. This is why many (the big ones 
gmail, yahoo and and.. all!) mail providers publish DMARC policy rules.

If you are running mailman you have to upgrade at least to 2.1.16-rc2
and setting
ALLOW_AUTHOR_IS_LIST = Yes
of for 2.1.16 and later
FROM_IS_LIST = Yes

and

REMOVE_DKIM_HEADERS = 1

in mm_cfg.py

Now you can set in general options for the list from_is_list to enabled.
mailman now sends SPF, DKIM and DMARC conform mails.

Andreas