The messages which have conversation threads of related messages have a conversation icon denoting the thread of messages.’ Click on the icon to view the entire conversation in a separate tab.
To view the emails in the sent folder as conversations, click the Preview whole conversation icon to the left of the email summary in the listing pane. The entire conversation linked with that email will open in the email preview pane. Learn more. ...
By default, the emails across folders are grouped together as conversations. You can change your default preference to Conversations within folders or even turn off the conversation views. Refer here for more details.
The timeline view is similar to an activity log, where the actions performed on a particular task, post, note or event get listed in the chronological order, indicating the time the action was performed. Learn More.
Whenever any email account violates the Zoho Mail's usage policy or organization policy, the account will get blocked. The organization administrator can view those accounts in the Troubleshoot section and unblock them. Refer here for more details.