Image: Optimizely Personalization suite product iconEmail Product Recommendations strategies

The following table shows Email Product Recommendations strategies.

Strategy Description
Abandoned basket products Shows products that were added to the basket Commerce: A collection of products selected by a website customer, with the intention of completing a purchase. Also known as a shopping cart or basket. but not purchased. Only baskets abandoned within the last 90 days and products currently available are considered.
Best sellers by conversion (last 90 days) Show best sellers based on conversion rate from the last 90 days, and the categories that the customer A site visitor who has made a purchase on your website. viewed.
Best sellers by revenue (last 30 days) Show products that generated the most revenue on site in the last 30 days. This strategy also takes categories into account; that is, it gives bias to products that sold well, and are in the same category Categories let you adjust the structure and range of a catalog to optimize the selling potential of products. You can use categories to search for products. You can also assign products to categories by creating relations. with which the customer has most interacted.
Best sellers by revenue per product view (last 90 days) Show products that generated the most revenue per numbers of views in the last 90 days. This strategy also takes categories into account; that is, it gives bias to products that sold well, and are in the same category with which the customer has most interacted.
Best sellers by units (last 7 days) Show best sellers based on number of products sold in the last 7 days.
Best trending (last 30 days) Show products that are gaining popularity; that is, whose unit sales are growing the most in the last 30 days.
Best trending based on previous purchases and views Show products that are gaining popularity; that is, whose unit sales are growing the most, based on the customer's previously viewed products and purchase history.
Co-purchased products based on previous purchases Show products that other customers also ordered when purchasing the same product as the customer, and that are in any category from which the customer has purchased.
Co-purchased products based on wishlist Show products bought together with products the customer has in their wish list.
Co-viewed products based on wishlist Show products viewed together with products the customer has in their wish list.
Cross-sells from previous purchases and views Show products bought together with products the customer bought and viewed in the past.
New Products (last 7/14/30 days) Show products recently added to the site (in the last 7, 14 or 30 days).
New products from purchased categories (last 120 days) Show new products from categories from which the customer previously made a purchase (in the last 120 days).
Newly discounted products based on viewing history Show recently discounted products related to products that the customer previously viewed.
Newly discounted products from viewing history Show recently discounted products that the customer previously viewed.
Popular co-purchased products Show popular items based on the customer’s purchased products (biased towards the most recently bought product).
Popular products based on previous purchases and views Show popular items from categories from which the customer recently made a purchase. If not enough are found from purchased categories, it shows popular products from categories that the customer recently viewed.
Popular products based on recent views Show popular products based on the customer’s recently viewed products.
Popular products from categories related to previous purchases Show popular items from categories that are related to categories from which the customer made a purchased.
Popular products from co-purchased and purchased categories Show products that other customers bought together with the same product as the customer, and are in the same or related category from which the customer made a purchase.
Popular products from co-purchased categories Show products that other customers bought together with the same product as the customer, and are in a related category from which the customer made a purchase.
Products from daily trigger A key performance indicator that measures how many visitors reached the target page. campaigns Used only with Triggers. Show products from daily trigger campaigns, such as Targeted discounts, High product interest, Post purchase, Low-in-stock abandoned-basket.
Products from in-session trigger campaigns Used only with Triggers. Show products from in-session trigger campaigns, such as Abandoned basket, Abandoned browse, Abandoned checkout.
Recently purchased products Show products the customer purchased, the most recent first.
Recently viewed products Show products the customer recently viewed.
Recommendations based on abandoned basket Show related products based on the customer’s abandoned basket items (biased towards the most recently abandoned product).
Recommendations based on the customer's popular views Show popular products from categories that the customer browsed most.
Recommendations based on daily trigger campaigns Used only with Triggers. Show related products based on the daily trigger used, such as Targeted discounts, High product interest, Post purchase, Low-in-stock abandoned-basket.
Recommendations based on in-session trigger campaigns Used only with Triggers. Show related products based on the in-session trigger used, such as Abandoned basket, Abandoned browse, or Abandoned checkout for the current session. 
Recommendations based on recent basket additions Show popular items based on products the customer added to basket.
Recommendations based on specified product refCodes Show recommendations based on what other customers purchased or viewed with the specified products. To use this strategy, a client needs to fill the value of the refCode variable in Mail recommendations links with product refCodes (for example, from a customer's order) and then the recommendations returned are based on those refCodes.
Recommendations from the category specified in Hints Show products from a particular category, which needs to be specified in the Hints section using the hint category.
Recommendations from categories of purchased products (last 365 days)

Show products from categories customer has purchased something within last 365 days.

In Germany, you can send email marketing advertisements to recent customers without explicit consent according to §7 Abs. 3 UWG, as long as the advertised products are "similar," relating to products the customer has already purchased within the past 365 days. Check your local laws.