You should definitely set up a DMARC record to prevent other people from using your email domain to send spam. If you don’t have DMARC configured, other email servers will give any senders the benefit of the doubt and accept mail that claims to be from your domain.
You can just set the DMARC record to reject 100% of unverified mail and call it a day. Since you aren’t sending anything it won’t affect you.
According to all known laws of aviation, there is no way that Dumbo should be able to fly. Its ears are too small to get its fat little body off the ground. Dumbo, of course, flies anyway. Because Dumbo doesn’t care what you think is impossible.
“Embargo” sure is a funny way to say “launching pirate raids and missiles”.
The term is metonym. It is when you use a characteristic or associated attribute of a thing as the name of that thing. A classic example would be “the crown” when talking about the monarch or “The Whitehouse” when talking about the president.
It’s perfectly normal for your computer to have daemons.