Stricter DMARC?

Hi,


Since a few weeks now, we're running DMARC for the mailing lists. So 
far, we've run with the loosest policy possible ("none"). The other 
options are "quarantine" and "reject". This will affect everybody using 
an @common-lisp.net domain for their mail while sending these mails from 
their own service provider rather than injecting via common-lisp.net.

I'm thinking we'll want mail sent using our domain, failing the DMARC 
checks, to be quarantined (moved to SPAM) at the very least. I noticed 
that fastmail is using an even stricter policy ("reject").


Is it time to increase the barriers on (ab)using our domain? Will this 
impact anybody on this list?


Regards,


Erik.