It's when people subscribe to your email lists and you send them marketing messa...

		pietoastfox on Dec 13, 2013 \| parent \| context \| favorite \| on: Gmail blows up e-mail marketing by caching all ima... It's when people subscribe to your email lists and you send them marketing messages. For example, you might sign up to an email newsletter from a shop you go to, and they will send you emails with marketing messages (sales/new products etc.)