[TeMPOraL]

> Instead of forcing your way into their inbox, you’re confirming and affirming an action they took—and you can always add a dose of cross-sell/up-sell into those messages.

Be very careful with that. It could be an easy way to make users hate you. If I'm on your site, I don't need to get an e-mail for every other click I make. I've already established a communication channel - namely, your website. It would be like you were texting stuff to me during a face-to-face conversation between us.

> But if the primary message is related to a user action, users will be less likely to drag that message over to the promotions tab.

If the message is about something you could have just displayed to me when I was performing that action, then be damn well sure I'll skip the "promotions" tab. I'll drag it straight to the spam. On principle.