At a vague guess I think it is in the file:
/usr/bin/dmarc_send_reports
Possibly in this sectiopn
sub email {
my ($to, $shrunk, $agg_ref) = @_;
.......
my $from = $report->config->{organization}{email};
...........
That file is triggered by /etc/crontab
15 0 * * * qpsmtpd /usr/bin/dmarc_send_reports 2>&1 | grep -v "SSL connection failed" | logger -t "DMARC Reporting"
There is some ini data here:
cat /etc/mail-dmarc.ini
However, I am not sure where it picks up your compnay name from.
I *think* that this information is stored in the sqlite DB here (be careful with this file - take a backup before messing about with it):
/var/lib/qpsmtpd/dmarc/reports.sqlite
The simple answer is to use 'and' in your company name.
Beyond that it may take some serious to digging to find and fix.