"This is about directly replies from me to people I have been emailing for months all of a sudden ending up in their Google Spam folder" Yup same exact thing.

"This is about directly replies from me to people I have been emailing for months all of a sudden ending up in their Google Spam folder" Yup same exact thing. Just the other day I sent my wife a few links from my business email account @company to her @gmail and it ended up in her spam folder. And I have been mailing her for longer than a few months as well. In other words google does not differentiate it appears on whether you have an ongoing relationship (email wise) with the person that you are sending an email to as if they are just looking at the mail message and nothing else.