When the Appliance is sends DMARC reports it also send two reports to the sender address.
1st email:
2019-04-08 01:30:13 smtp postfix/backend/cleanup[67082]: 5F477E26E6_CAA1785B: message-id=<20190407153013.5F477E26E6_CAA1785B@smtp.domain.com>
2019-04-08 01:30:13 smtp postfix/backend/qmgr[2624]: 5F477E26E6_CAA1785B: from=<>, size=4573, nrcpt=1 (queue active)
2019-04-08 01:30:13 smtp postfix/backend/smtp[67149]: 5F477E26E6_CAA1785B: to=<noreply-dmarc@domain.com>, relay=192.168.1.3[192.168.1.3]:25, delay=0.2, delays=0/0/0.02/0.18, dsn=2.6.0, status=sent (250 2.6.0 <20190407153013.5F477E26E6_CAA1785B@smtp.domain.com> [InternalId=8559869820931, Hostname=exchange.internal] 5859 bytes in 0.103, 55.036 KB/sec Queued mail for delivery)
2019-04-08 01:30:13 smtp postfix/backend/qmgr[2624]: 5F477E26E6_CAA1785B: removed
2019-04-08 01:30:13 smtp postfix/backend/smtp[67149]: setting up TLS connection to 192.168.1.3[192.168.1.3]:25
2019-04-08 01:30:13 smtp postfix/backend/smtp[67149]: Trusted TLS connection established to 192.168.1.3[192.168.1.3]:25: TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)
2nd email:
2019-04-08 01:30:26 smtp postfix/backend/cleanup[67315]: 23EA5E2720_CAA1792B: message-id=<20190407153026.23EA5E2720_CAA1792B@smtp.domain.com>
2019-04-08 01:30:26 smtp postfix/backend/qmgr[2624]: 23EA5E2720_CAA1792B: from=<>, size=4609, nrcpt=1 (queue active)
2019-04-08 01:30:26 smtp postfix/backend/smtp[67103]: 23EA5E2720_CAA1792B: to=<noreply-dmarc@domain.com>, relay=192.168.1.3[192.168.1.3]:25, delay=0.13, delays=0.01/0/0.01/0.11, dsn=2.6.0, status=sent (250 2.6.0 <20190407153026.23EA5E2720_CAA1792B@smtp.domain.com> [InternalId=8559869820932, Hostname=exchange.internal] 5895 bytes in 0.102, 55.967 KB/sec Queued mail for delivery)
2019-04-08 01:30:26 smtp postfix/backend/qmgr[2624]: 23EA5E2720_CAA1792B: removed
2019-04-08 01:30:26 smtp postfix/backend/smtp[67103]: setting up TLS connection to 192.168.1.3[192.168.1.3]:25
2019-04-08 01:30:26 smtp postfix/backend/smtp[67103]: Trusted TLS connection established to 192.168.1.3[192.168.1.3]:25: TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)
The issue is the emails never come through. Especially if the sender address is "no-reply", no such inbox/user exists.
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