Streamed Emails by Einstein Activity Capture Doesn't Always Appear on Account Record

When capturing emails to the Account record, only emails from the first 50 directly related Contacts are added to the Account’s activity timeline. The first 50 Contacts are determined by Contact Record ID in ascending order.

You will see the first 50 Contacts by using the following query:

SELECT Id,AccountId,Email,LastModifiedDate,Name FROM Contact WHERE AccountId = 'Account record ID' ORDER BY ID ASC

This behavior is a limitation of Einstein Activity Capture. Emails that get crawled or captured using Einstein Activity Capture (EAC) are not stored as EmailMessage records in the Salesforce database. They are stored in Amazon Web Service (AWS) database. Salesforce user interface just shows these streamed emails, where any custom logic on EAC captured emails will not work; due to not having any Salesforce APIs exposed to control them.

Refer to Einstein Activity Capture Security Guide for more information about Einstein Activity Capture security settings.

Also, the limit is in place to accommodate relationship handling and association we maintain on the AWS side. Note: We don’t have direct control over this item.