See DMARC configuration including tags and reporting
Currently stalwart does not support setting of all DMARC tags for DNS automation. Current;ly only v=DMARC1; p=reject; rua=: is configured in the DNS record. The rua field also is shared with thos of other features like TLS-RPT or CAA.
So now DMARC is pretty much the only DNS record not automated by Stalwart for me.
Seems a missed opportunity?