Thank you for the thorough response. Right now, focusing learning about the very first line of your suggestions. There is some anti-spam guidelines from Google about their new requirements:
Important: Starting November 2022, new senders who send email to personal Gmail accounts must set...
There presumably is a threshhold for this. Technically, sending any unsolicited, unwanted email to an individual could be considered spam. Certainly, that entity has a right to go to their email account, and declare that email spam.
Someone doing outbounding is likely to have at...