---
schema_version: "1"
id: ab39ed96680e23c0fcb9bf9023203326161523e819a784e792580900df7cce86
title: FAQs for Open Time Email Campaigns
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_pers_email_campaign_faq.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_faq.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: e9ef98a0049830c593818bd5396d83f3b7de960d12f9c3a61f0c4e954211d95d
description: Refer to the following frequently asked questions about open time email campaigns.
products:
  - Marketing
  - Salesforce Personalization
release: "264"
---
# FAQs for Open Time Email Campaigns

Refer to the following frequently asked questions about open time email campaigns.

## How often does Marketing Cloud Personalization recalculate open time email recommendations?

Personalization recalculates recommendations after 1 hour. For more information, see “Recommendation Calculation Interval” in [About Open Time Email Campaigns](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_about.htm&release=264.0.0&type=5 "Email campaigns use an individual’s unique intent and preferences to deliver true 1:1 personalized content, regardless of the email marketing or marketing automation system. With Marketing Cloud Personalization open time email campaigns, you can deliver up-to-the-second personalized content and recommendations. Email messages can address a customer’s latest actions on your site, include expiration date reminders, show low product inventory levels, and more.").

## Can I set an expiration time for open time email recommendations?

Yes. You can change the expiration time that Personalization uses when recalculating recommendations. For more information, see [Change the Expiration Time for Recommendations](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_recommendation_expiration.htm&release=264.0.0&type=5 "Recalculate recommendations that Personalization shows to users after a set time has elapsed.").

## Does using Apple Mail affect how recommendations are generated?

Because of the way Apple handles requests, Personalization generates recommendations at send time, rather than open time. For more information, see “Recommendations in Apple Mail” in [About Open Time Email Campaigns](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_about.htm&release=264.0.0&type=5 "Email campaigns use an individual’s unique intent and preferences to deliver true 1:1 personalized content, regardless of the email marketing or marketing automation system. With Marketing Cloud Personalization open time email campaigns, you can deliver up-to-the-second personalized content and recommendations. Email messages can address a customer’s latest actions on your site, include expiration date reminders, show low product inventory levels, and more.").

## How does Open Time Email handle image generation?

When an open time item template is published, an image generation job creates the initial set of images for all items that match the item type of the template. For more information, see “Open Time Email Image Generation” in [About Open Time Email Campaigns](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_about.htm&release=264.0.0&type=5 "Email campaigns use an individual’s unique intent and preferences to deliver true 1:1 personalized content, regardless of the email marketing or marketing automation system. With Marketing Cloud Personalization open time email campaigns, you can deliver up-to-the-second personalized content and recommendations. Email messages can address a customer’s latest actions on your site, include expiration date reminders, show low product inventory levels, and more.").

## How often does Marketing Cloud Personalization update an image for an item?

If an item is updated and the metadata referenced by an open time email template changes, the item is queued for an image refresh. There are considerations for the rate at which item updates occur or are sent to Personalization.

For detailed information, see “Open Time Email Image Updates” in [About Open Time Email Campaigns](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_about.htm&release=264.0.0&type=5 "Email campaigns use an individual’s unique intent and preferences to deliver true 1:1 personalized content, regardless of the email marketing or marketing automation system. With Marketing Cloud Personalization open time email campaigns, you can deliver up-to-the-second personalized content and recommendations. Email messages can address a customer’s latest actions on your site, include expiration date reminders, show low product inventory levels, and more."). For information about troubleshooting issues, such as missing or blurry images, see [Image Generation in Open Time Email Campaigns](https://developer.salesforce.com/docs/marketing/personalization/guide/image-generation-email-campaigns.html) in the Marketing Cloud Personalization developer documentation.

## Can I preview an open time email campaign?

You can access an Open Time Email Simulator Preview in the open time email campaign editor. This preview allows you to search for an individual item and preview email recommendations. You can refresh images for an open time email item on the item template edit screen. With an item image preview on the Personalization CDN, you can see which image is stored in the CDN for a given template and item.

For more information see “Open Time Email Testing and Preview” in [About Open Time Email Campaigns](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_about.htm&release=264.0.0&type=5 "Email campaigns use an individual’s unique intent and preferences to deliver true 1:1 personalized content, regardless of the email marketing or marketing automation system. With Marketing Cloud Personalization open time email campaigns, you can deliver up-to-the-second personalized content and recommendations. Email messages can address a customer’s latest actions on your site, include expiration date reminders, show low product inventory levels, and more."). For troubleshooting information, see [Image Generation in Open Time Email Campaigns](https://developer.salesforce.com/docs/marketing/personalization/guide/image-generation-email-campaigns.html) in the Marketing Cloud Personalization developer documentation.

## Why do I see an image in the simulator that is different than in the actual email?

Browser and third-party caching can affect the refresh rate of open time email images. For more information see “Open Time Email Testing and Preview” in [About Open Time Email Campaigns](https://help.salesforce.com/s/articleView?id=mktg.mc_pers_email_campaign_about.htm&release=264.0.0&type=5 "Email campaigns use an individual’s unique intent and preferences to deliver true 1:1 personalized content, regardless of the email marketing or marketing automation system. With Marketing Cloud Personalization open time email campaigns, you can deliver up-to-the-second personalized content and recommendations. Email messages can address a customer’s latest actions on your site, include expiration date reminders, show low product inventory levels, and more."). For troubleshooting information, see [Image Generation in Open Time Email Campaigns](https://developer.salesforce.com/docs/marketing/personalization/guide/image-generation-email-campaigns.html) in the Marketing Cloud Personalization developer documentation.

## Why does the Open Time Email simulator return different item images, or return item images in different order, for experiences or campaigns using different item templates but identical recipes (without any exclusions)?

When using different item templates, we can’t guarantee that Open Time Email provides identical item images across different experiences or campaigns, even when you use the same recipe. Because the system recommends and generates images separately for each item-template pair, variations can occur. These variations can include presenting different item images, or displaying images in a different order.

## Can I use localization in my Open Time Email campaigns?

At this time, localization isn’t available to use with Open Time Email campaigns.