In article <871rmukg4q....@wedjat.horus-it.com> you write:
>* John Levine via mailop:
>
>> Mailing lists have only been adding subject tags since the 1980s.
>
>I do not wish to delve into whether these tags are useful or not, but
>rewriting subjects or bodies invalidate existing DKIM signatures.

Yes, we knew that 15 years ago when we published the DKIM specs.

>I recommend using separate domains, or subdomains, for regular business
>and for mailing lists, combined with separate DMARC policies, e.g.
>'quarantine' for example.org and 'none' for mlists.example.org.

I agree that it is not a great idea to mix mailing lists and other
correspondence in the same domain. It is equally a bad idea to mix
mailboxes used by actual people and role addresses that send bulk mail.


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