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.