choose the right email address to send to the lists

[coreyh@free.fr]

I saw some people using email addresses like yahoo, AOL, mail.ru to post 
messages to the lists (such as debian-user, postfix-user etc).

I am thinking those addresses which have the strictest DKIM setup are 
not suitable to send a list mail, they will be blocked by many 
recipients (list members).

For example, yahoo has this DMARC setting:

v=DMARC1; p=reject; pct=100; rua=mailto:d@rua.agari.com; 
ruf=mailto:d@ruf.agari.com;

And Mail.ru:

v=DMARC1;p=reject;rua=mailto:dmarc_rua@corp.mail.ru

And zoho.com:

v=DMARC1; p=reject; sp=reject; fo=0; 
rua=mailto:dmarcaggregation@zoho.com; 
ruf=mailto:dmarcaggregation@zoho.com

The all have "p=reject" rules which mean when DKIM (most modern email 
providers have this enabled) break at the recipient end, this mail will 
be rejected by the recipient MTA.

As we know DKIM will fail due to:

1. SPF fail (for the From: address in header) - this will 100% happen 
regardless list server implements SRS or not.
2. DKIM fail (for header address as well) - this will most probably 
happen since some list servers change the message content by adding a 
signature etc.


So we should choose a email address which at least has no "p=reject" in 
their DKIM policy.

For example, gmail is good:
v=DMARC1; p=none; sp=quarantine; rua=mailto:mailauth-reports@google.com

Free.fr (the one I am using):
v=DMARC1;p=none;adkim=r;aspf=r;sp=none

GMX.net:
v=DMARC1; p=none; sp=quarantine; rua=mailto:dmarcreport@gmx.net; 
ruf=mailto:dmarc-ruf@gmx.net; adkim=r;aspf=r; fo=1


They all have "p=none" so they probably have no delivery issues to 
mailing lists.

Just my thought though...

Thanks
Corey H