---
title: "Mail modules: Recommendation Strategies"
description: This article provides a comprehensive overview of all mail modules currently available in our platform. Each module plays a specific role in powering personalized recommendations, merchandising strategies, and user experiences in your email channel. The documentation includes detailed descriptions, technical names, and key functionalities for each module as well as a Glossary at the end of the article.
---
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# Mail modules: Recommendation Strategies
This article is the full technical reference for every mail recommendation module on the platform: technical names, and which features (personalized reranking, backfilling, filters, and so on) each one supports. Each module plays a specific role in powering personalized recommendations, merchandising strategies, and user experiences in your email channel. If you're deciding which strategy to use for a specific email, see [*Introduction to Mail Recommendation Strategies*](https://content.raptorservices.com/help-center/introduction-to-mail-recommendation-strategies-?hsLang=en) instead, it covers the five most commonly used modules with guidance on when to use each. This article also includes a Glossary at the end.
| **Item modules: Contextual** | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| **Technical name** | **Personalized Rerank Opportunities** | **Candidate set** | **Explicit Schema Rules** | **Back-filling** | **Merchandising Boost** | **OData-filter** | **Content- / Product- / Category- / Brand-filter** | **FullInfo** |
| [**GetPIMRelatedItemsMail**](https://content.raptorservices.com/help-center/how-to-setup-getrelateditems-2.0?hsLang=en) | ✓ | Bought Together and more | Target Group, Category, Brand, etc. | Trending (visit) | ✓ | ✓ | ✓ | ✓ |
| **GetPopularItemsInBrandMail** | ✓ | Top in Brand | | Popular Items | ✓ | ✓ | ✓ | ✓ |
| **GetPopularItemsInCategoryMail** | ✓ | Popular Items | | Popular Items | ✓ | ✓ | ✓ | ✓ |
| **GetSelectedItemsMail** | | | | | | | | ✓ |
| **GetSimilarItemsMail** | ✓ | Visited Together | Same category | Top in category \> Popular | ✓ | ✓ | ✓ | ✓ |
| **Item modules: Global** | | | | | | | | |
| **Technical name** | **Personalized Rerank Opportunities** | **Candidate set** | **Explicit Schema Rules** | **Back-filling** | **Merchandising Boost** | **OData-filter** | **Content- / Product- / Category- / Brand-filter** | **FullInfo** |
| **GetPopularItemsMail** | ✓ | Trending and Popular | | | ✓ | ✓ | ✓ | ✓ |
| [**GetMerchandisingItemsMail**](https://content.raptorservices.com/help-center/introduction-to-customized-feeds?hsLang=en) | ✓ | Merchandising Products | Popularity & Discount | | | | ✓ | |
| **Item modules: User** | | | | | | | | |
| **Technical name** | **Personalized Rerank Opportunities** | **Candidate set** | **Explicit Schema Rules** | **Back-filling** | **Merchandising Boost** | **OData-filter** | **Content- / Product- / Category- / Brand-filter** | **FullInfo** |
| **GetUserItemHistoryMail** | | User History | | Popular Items | | ✓ | ✓ | ✓ |
| **GetUserCrossSellingItemsMail** | ✓ | Look Alike Items | | Favorite Category and Brand | ✓ | ✓ | ✓ | ✓ |
| [**GetUserItemRecommendationsMail**](https://content.raptorservices.com/help-center/how-to-set-up-getuseritemrecommendationsweb-personal-shopping-assistant?hsLang=en) | ✓ | Look Alike Items | | Favorite Category \> Popular | ✓ | ✓ | ✓ | ✓ |
| **GetUserLookAlikeItemsMail** | ✓ | Look Alike Items | | Favorite Category \> Popular | ✓ | ✓ | ✓ | ✓ |
| **Content modules: Contextual** | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| **Technical name** | **Personalized Rerank Opportunities** | **Candidate set** | **Explicit Schema Rules** | **Back-filling** | **Merchandising Boost** | **OData-filter** | **Content- / Product- / Category- / Brand-filter** | **FullInfo** |
| **GetContentBasedOnItemMail** | ✓ | Product to Content | | | ✓ | ✓ | ✓ | ✓ |
| **GetContentBasedOnProductBrandMail** | ✓ | Brand to Content | | Popular Content | ✓ | ✓ | ✓ | ✓ |
| **GetContentBasedOnProductCategoryMail** | ✓ | Category to Content | | Popular Content | ✓ | ✓ | ✓ | ✓ |
| **GetItemsBasedOnContentMail** | ✓ | Content to Products | Category and Brand | Top Viewed | ✓ | ✓ | ✓ | ✓ |
| **GetSimilarContentMail** | ✓ | Visited together | Same Category | Top Viewed | ✓ | ✓ | ✓ | ✓ |
| **Content modules: Global** | | | | | | | | |
| **Technical name** | **Personalized Rerank Opportunities** | **Candidate set** | **Explicit Schema Rules** | **Back-filling** | **Merchandising Boost** | **OData-filter** | **Content- / Product- / Category- / Brand-filter** | **FullInfo** |
| [**GetMerchandisingContentMail**](https://content.raptorservices.com/help-center/introduction-to-customized-feeds?hsLang=en) | ✓ | Merchandising Products | Popularity | | | | ✓ | |
| **GetPopularContentMail\*** | ✓ | Trending and Popular | Overall Popular | | ✓ | ✓ | ✓ | ✓ |
| \* *Trending: Reflects the change in popularity over the selected time period — indicating whether a product has become more popular.* **Content modules: User** | | | | | | | | |
| **Technical name** | **Personalized Rerank Opportunities** | **Candidate set** | **Explicit Schema Rules** | **Back-filling** | **Merchandising Boost** | **OData-filter** | **Content- / Product- / Category- / Brand-filter** | **FullInfo** |
| **GetUserContentHistoryMail** | | Recent History | | Popular Content | | ✓ | ✓ | ✓ |
| [**GetUserContentRecommendationsMail**](https://content.raptorservices.com/help-center/how-to-set-up-getuseritemrecommendationsweb-personal-shopping-assistant?hsLang=en) | ✓ | Similar Content | | Top in Favorite Content | ✓ | ✓ | ✓ | ✓ |
### Glossary
This glossary provides definitions for technical terms used in this article.
**Backfilling**
Definition: Products to be added at the end of the prioritized list of products when personalized recommendations aren’t available.
**Candidate set**
Definition: Defines the logic of the module - how the product selection is made, which data sources and filters are applied, and which attributes influence the final candidate list shown to the user. In Merchandising, this list (typically 50 products) is dynamic and behavior-based, forming the limited set within which boosting actions can take place.
**Content- / Product- / Category- / Brand-filter**
Definition: Use this filter to remove item from the output based on a comma separated list.
**Explicit Schema Rules**
Definition: Module specific filtering. The rules are set up via a customized schema.
**Fullinfo**
Definition: All mapped parameters from the item Schema are included in the API output. This enriches the recommendation data with additional item attributes.
**Merchandising Boost**
Definition: Boosting products with a given value from the product Schema via Merchandising Boosted Campaigns.
**ODatafilter**
Definition: Use this filter to remove groups of products from the output. Can be used on all mapped parameters from the product schema. [Read more](https://content.raptorservices.com/help-center/filtering?hsLang=en).
**Personalized Rerank Opportunities**
Definition: Reranking the products based on User & Cookie; buy, basket and visit + Items similar or related to the user interactions. [Read more](https://content.raptorservices.com/help-center/module-adjustment-and-tuning?hsLang=en).
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