I have a new domain. It has existed for only 3 weeks.
Today its postmaster@ account received a
DMARC report from Google stating that Google had received 41 incoming Emails sent "from" the domain in the prior 24 hours.
The number of Emails sent by the domain's mail server to Google in that time?
Zero.
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Spoofed "From" Email is very common. Far more common than "hacked" user accounts used to send Spam.