Often HR emails go to junk or spam mail and are flagged as spam. Why? No idea

I have a friend who missed out on their dream job because the employer emailed him for an interview but it went to junk mail and he didn’t find out until after the posting closed.

It could be disappointing; never the less, you can always check your spam inbox

source: https://bimberbuzz.com/if-you-are-applying-for-jobs-or-anything-important-check-your-spam-inbox-regularly/