[dmarc-discuss] options on multiple from

John Levine johnl at taugh.com
Wed Jul 17 10:32:30 PDT 2013

It seems to me that there is a fairly short list of ways that DMARC can deal
with addresses with more than one address on the From line:

a) exclude them, anything with multiple addresses fails
b) if the two addresses are in the same domain, do the usual thing, otherwise fail
c) evaluate separately, take the strictest result
d) evaluate seaparetly, take the loosest result

Fail would probably mean to apply the failure rule for each domain so a) is in
practice pretty close to c)

I think it is reasonable to say that if you want to use DMARC, don't
use multiple addresses, since it's not a feature that is well
supported anywhere.

More information about the dmarc-discuss mailing list