When you view the activities related to a contact, lead, or person account, keep in
mind how the activity timeline and the activity history view differ.
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The activity timeline and the activity history view are two different views, and behave
differently.
One difference appears when you send a list email to multiple contacts, leads, or campaign
members. On each recipient’s activity timeline, the list email appears as one entry. When you
click View All to view the recipient’s activity history, however, every
email sent by the list email is shown.
For example, send a list mail to two contacts in an account. On the account’s activity
timeline, the list email shows as one item. Then click View All on the
Activity Timeline to open the activity history view. Two emails appear: one for each of the
contacts in the list mail.