Difference between graymail and spam
Receiving advertising or newsletters are good examples of graymail. These messages, “which were agreed at a given point in time”, are sent in ever-greater volumes, and can be distracting. Notifications from social networks, newsletters, information from your suppliers — all these emails can result in lost productivity.
Spam or spamming is a massive and automatic sending, sometimes repeated, of unsolicited emails, to people with whom the sender has never had contact, and who has obtained the email addresses in an irregular fashion.