Heho,
As said by Alessandro; You will have to make the tool you are currently using 
for validating DKIM/SPF -> DMARC generate and send the reports.

What works well for me is rspamd [1], but there is also a tool for postfix 
(iirc; maybe somebody else can weigh in there). Similarly, there should be 
something for TLS-RPT.

What you should keep in mind when setting this up, though, is that you can 
actually run into rather loop-y behavior if you originate your dmarc reports 
from a domain that requests reports itself (best practice would be originating 
from a subdomain not requesting reports; you could also exclude originating 
reports for that domain, at least with rspamd):
- You get a mail
- You sent a report
- Other party gets a mail (the report)
- Other party sends out report (because they got a mail from you)
- You get a mail...

For my setup, that is something I still plan to fix. :-|

With best regards,
Tobias

[1] https://rspamd.com/doc/modules/dmarc.html

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