I find it interesting how many missed opportunities happen with online businesses. The reasons vary greatly for this by client, budget, etc... But it is especially apparent on those businesses and organizations that have marketing budgets but have been slow to adapt to the web, or sometimes, just "don't get it".
Post-order communication is such a crucial element in the marketing process, however many businesses take it for granted. It does, after all, take place after the sale (or conversion). When a customer has completed your intended result on your website (completed a purchase, filled out a contact form, requested a brochure, etc...), your duty is done. You have converted a visitor to your website into a customer or a measurable trackable goal. However there is still so much more opportunity. You now have information about this visitor. Valuable information that you can customize specifically for this individual. You also have their attention. Chances are, after completing the conversion on your website, the very next email they receive from you will be read.
This is HUGE!
Don't miss this opportunity to engage your customer, educate them or offer them something they may want or need (this must be personalized and not generic).